Need Recommendations For New Exhaust
08-16-2016, 04:16 PM
#1
Need Recommendations For New Exhaust
OK, so here's what I have now:
SLP 1 3/4 shortie headers
SLP dual cat y-pipe
Dual Random Technologies cats
Custom mandrel-bent 3" intermediate pipe
Flowmaster 40
I'm just bored with it. First, I'm sick and tired of the "Flowmaster sound"
Second, it's too quiet.
I want loud. I want disruptive.
I want to scare little old ladies and members of the clergy when I drive by.
I want the cop sitting in the speed trap to spill his donuts and coffee when I pass.
When I come down the street, I want car alarms going off, dogs howling, and strippers and cocktail waitresses smiling.
The closest I can come to what I'm thinking of is this awesome truck in the Cherry Bomb commercial:
I want to disturb the peace!
I thought about the old SLP Loudmouth, but that was for 4th gens, and I think I read something somewhere about there being fitment problems on 3rd gens.
Besides, I've listened to some clips on youtube, and I think the SLP loudmouth may be too tame for what I want.
Suggestions?
SLP 1 3/4 shortie headers
SLP dual cat y-pipe
Dual Random Technologies cats
Custom mandrel-bent 3" intermediate pipe
Flowmaster 40
I'm just bored with it. First, I'm sick and tired of the "Flowmaster sound"
Second, it's too quiet.
I want loud. I want disruptive.
I want to scare little old ladies and members of the clergy when I drive by.
I want the cop sitting in the speed trap to spill his donuts and coffee when I pass.
When I come down the street, I want car alarms going off, dogs howling, and strippers and cocktail waitresses smiling.
The closest I can come to what I'm thinking of is this awesome truck in the Cherry Bomb commercial:
I want to disturb the peace!
I thought about the old SLP Loudmouth, but that was for 4th gens, and I think I read something somewhere about there being fitment problems on 3rd gens.
Besides, I've listened to some clips on youtube, and I think the SLP loudmouth may be too tame for what I want.
Suggestions?
08-17-2016, 08:07 AM
#3
Supreme Member
Re: Need Recommendations For New Exhaust
Start by getting rid of 1-3/4 headers on a 305
08-17-2016, 08:13 AM
#4
Re: Need Recommendations For New Exhaust
Cheapest and easiest way to achieve what you want is to ditch the cats and either go with a turndown under the car or run a SLP LM2 and not use any resonator at all. Running a 305 with headers, no cats and a turndown a few feet after the ypipe is most likely going to kill your engine power but it will make for a loud car.
My personal opinion, leave the headers in, ditch the cats and just replace the muffler with either resonator or some other muffler and call it a day. If the headers are not causing any issues then leave them be because youre going to open up a can of worms taking them off and then looking for replacements. Most headers for these cars suck.
Oh and make sure you keep a big bottle of Tylenol in the car!!!
My personal opinion, leave the headers in, ditch the cats and just replace the muffler with either resonator or some other muffler and call it a day. If the headers are not causing any issues then leave them be because youre going to open up a can of worms taking them off and then looking for replacements. Most headers for these cars suck.
Oh and make sure you keep a big bottle of Tylenol in the car!!!
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08-17-2016, 09:54 AM
#8
Re: Need Recommendations For New Exhaust
When I put them on the car, I also put on a set of Made For You plug wires with asbestos sleeves. They were billed as "lifetime" wires that would never burn or melt, and so far, they've definitely lived up to the hype.
My only problem with the SLP 1 3/4 headers has been getting to the #6 spark plug. It takes 10 years' worth of cussing to get that plug in and out. Hands down, the most miserable thing I've ever done on this car. I've actually thought about switching to Dyno Don's headers just over that issue.
08-17-2016, 10:11 AM
#9
Re: Need Recommendations For New Exhaust
I've had mine on the car since December, 2003, and have had 0 problems.
When I put them on the car, I also put on a set of Made For You plug wires with asbestos sleeves. They were billed as "lifetime" wires that would never burn or melt, and so far, they've definitely lived up to the hype.
My only problem with the SLP 1 3/4 headers has been getting to the #6 spark plug. It takes 10 years' worth of cussing to get that plug in and out. Hands down, the most miserable thing I've ever done on this car. I've actually thought about switching to Dyno Don's headers just over that issue.
When I put them on the car, I also put on a set of Made For You plug wires with asbestos sleeves. They were billed as "lifetime" wires that would never burn or melt, and so far, they've definitely lived up to the hype.
My only problem with the SLP 1 3/4 headers has been getting to the #6 spark plug. It takes 10 years' worth of cussing to get that plug in and out. Hands down, the most miserable thing I've ever done on this car. I've actually thought about switching to Dyno Don's headers just over that issue.
I just put Dyno Don headers on my car and I need to install #6 and #8 from under the car. Some can do it from up top but I just cant get my hands in there with the A/C in place.
08-18-2016, 10:44 AM
#11
Supreme Member
08-18-2016, 01:22 PM
#13
Re: Need Recommendations For New Exhaust
Any car will benefit from headers. A motor is a air pump, it has to breathe. Enough said. Now with all what you want, I hope you have a thick wallet, because the cop's will love you. There are many options out there from straight pipes off the header to nice sounding exhaust systems. I personally have a Borla exhaust with an electric cut out on the "Y" flange in the back. It goes from mild to wild with a flip of the switch. You could keep your system and add cut outs, or change it completely. The best thing to do is go to car shows and listen to what other people are using and talk to them about their systems. I don't think you are emission tested in OK. are you? If not, you can ditch the AIR, and cats
Last edited by red rock; 08-18-2016 at 01:26 PM.
08-18-2016, 02:20 PM
#14
Re: Need Recommendations For New Exhaust
Any car will benefit from headers. A motor is a air pump, it has to breathe. Enough said. Now with all what you want, I hope you have a thick wallet, because the cop's will love you. There are many options out there from straight pipes off the header to nice sounding exhaust systems. I personally have a Borla exhaust with an electric cut out on the "Y" flange in the back. It goes from mild to wild with a flip of the switch. You could keep your system and add cut outs, or change it completely. The best thing to do is go to car shows and listen to what other people are using and talk to them about their systems. I don't think you are emission tested in OK. are you? If not, you can ditch the AIR, and cats
The problem with going to car shows and listening is, most cars have true duals. When you find out what they have, and get the 3"-in, dual 2 1/2" out transverse mounted version of the muffler, it sounds completely different.
08-18-2016, 02:29 PM
#15
Re: Need Recommendations For New Exhaust
We aren't tested in Oklahoma, but I want the car to remain smog legal ... just a personal thing with me.
The problem with going to car shows and listening is, most cars have true duals. When you find out what they have, and get the 3"-in, dual 2 1/2" out transverse mounted version of the muffler, it sounds completely different.
The problem with going to car shows and listening is, most cars have true duals. When you find out what they have, and get the 3"-in, dual 2 1/2" out transverse mounted version of the muffler, it sounds completely different.
08-21-2016, 03:40 PM
#18
Supreme Member
Re: Need Recommendations For New Exhaust
Thats about as ignorant as ignorant can be with that statement, Might as well throw 1-7/8 on his 305 while he at it LMFAO
Any car will benefit from headers. A motor is a air pump, it has to breathe. Enough said. Now with all what you want, I hope you have a thick wallet, because the cop's will love you. There are many options out there from straight pipes off the header to nice sounding exhaust systems. I personally have a Borla exhaust with an electric cut out on the "Y" flange in the back. It goes from mild to wild with a flip of the switch. You could keep your system and add cut outs, or change it completely. The best thing to do is go to car shows and listen to what other people are using and talk to them about their systems. I don't think you are emission tested in OK. are you? If not, you can ditch the AIR, and cats
08-21-2016, 03:55 PM
#20
Supreme Member
Re: Need Recommendations For New Exhaust
Because your stock 305 doesn't need them, bigger isn't better especially with headers. You'd be fine with 1-1/2 or possibly 1-5/8, who ever talked you into 1-3/4 headers for your car gave you the wrong advice. Having too big of exhaust will kill velocity, horsepower and bottom end torque
08-21-2016, 04:03 PM
#21
Re: Need Recommendations For New Exhaust
Because your stock 305 doesn't need them, bigger isn't better especially with headers. You'd be fine with 1-1/2 or possibly 1-5/8, who ever talked you into 1-3/4 headers for your car gave you the wrong advice. Having too big of exhaust will kill velocity, horsepower and bottom end torque
08-21-2016, 05:06 PM
#22
Re: Need Recommendations For New Exhaust
And here we have a fellow that thinks calling someone ignorant is a way to help explain his ignorant view point. You obviously don't have a clue about what you think is correct. There was no mention of going to bigger headers. 1 3/4" headers are totally acceptable for a 305. He's looking for a louder sound to his exhaust. If you think he should be ditching his headers, give him some facts, or else help him with some idea's for a louder exhaust.
08-21-2016, 05:30 PM
#23
Supreme Member
Re: Need Recommendations For New Exhaust
I'm embarrassed for both of you, have fun being misinformed. I already explained enough, There's thousands of post on TGO let alone the interwebs that will explain it to you cause thats where both of your misinformation came from in the first place. Saying and using 1-3/4 headers on a stock 305 is laughable at best
And here we have a fellow that thinks calling someone ignorant is a way to help explain his ignorant view point. You obviously don't have a clue about what you think is correct. There was no mention of going to bigger headers. 1 3/4" headers are totally acceptable for a 305. He's looking for a louder sound to his exhaust. If you think he should be ditching his headers, give him some facts, or else help him with some idea's for a louder exhaust.
08-22-2016, 12:03 AM
#24
Re: Need Recommendations For New Exhaust
I'm embarrassed for both of you, have fun being misinformed. I already explained enough, There's thousands of post on TGO let alone the interwebs that will explain it to you cause thats where both of your misinformation came from in the first place. Saying and using 1-3/4 headers on a stock 305 is laughable at best
You know, I've been on this forum for over 13 years. It's the best source of information for TBIs there is.
Unfortunately, it's also the best source of disinformation on TBIs there is, as well, and you are proof of that.
It's never ceased to amaze me how, even when confronted with facts and proof, people like you refuse to be moved. What's more, you come into this discussion sneering at people and insulting them.
Ignorant? The only ignorant person in this discussion is you, and you embrace your ignorance. You rub it all over yourself like a stripper with poison ivy rubs calomine lotion on her hoo haas.
I long ago got tired of dealing with people like you. No matter how many times you get pwned, you just keep popping back up. I'm not, however, going to just let you pollute my thread with your garbage.
You said:
Because your stock 305 doesn't need them, bigger isn't better especially with headers. You'd be fine with 1-1/2 or possibly 1-5/8, who ever talked you into 1-3/4 headers for your car gave you the wrong advice. Having too big of exhaust will kill velocity, horsepower and bottom end torque
This particular piece of foolishness started with an article Car Craft did back in the 90s. They took a junkyard 305 out of an El Camino (NOT an L03, NOT a TBI), put it on a dyno, and tested a number of intake, carb, and header combinations.
The headers they had the best results with had 1 5/8 primaries. They made slightly less peak hp, but more low and midrange torque than the 1 3/4 primary headers they tested.
This turned into "1 3/4 headers KILL bottom end torque on L03s!!!!" on this board, but no one ever produced any proof of it.
In the discussions that went on at the time, numerous people pointed out that the headers in the story were long-tube, equal-length, TUNED headers, not shortie headers, and there could be no comparison made between the two.
The TBI fanboys would hear none of it.
You said:
I'm embarrassed for both of you, have fun being misinformed. I already explained enough, There's thousands of post on TGO let alone the interwebs that will explain it to you cause thats where both of your misinformation came from in the first place. Saying and using 1-3/4 headers on a stock 305 is laughable at best
You see, 13 years ago, I put 1 3/4" primary headers on a stock L03, and not only did peak HP and torque increase, HP and torque were up at every single point of the rpm band. Everywhere.
Let me make sure you understand. At every single point in the rpm band, HP and torque were higher with the 1 3/4" primary headers than they had been with the stock exhaust manifolds.
There was no loss of torque.
1 3/4" primary shortie headers did not "kill" my L03.
You, sir, do not know what the hell you are talking about.
More importantly, you act like a jerk.
Now, prove me wrong, or STFU.
What's next, ultimate TBI mods are worth 10hp?
Last edited by seanof30306; 08-22-2016 at 12:23 AM.
08-22-2016, 06:47 AM
#25
Senior Member
Join Date: Jan 2006
Location: League City, TX
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Car: 90 Formula -- tot resto in progress
Engine: 350
Transmission: 700R4 w/ 2500 stall, by Owen @ ARD
Axle/Gears: 3.23 posi disc
Re: Need Recommendations For New Exhaust
Don't want to get sucked into the vortex of exhaust system "science" 
sean, from the list of mods, its clear you put considerable time & effort
into your third-gen
So my question may be a bit esoteric, but...
Why are you still chained to that pitiful 305?
Even with an "open" exhaust, when you pass by the people in your
example, I guarantee you the response will be "Ho-hum, just another
loud-mouth boat-anchor 305."
For the love of everything GM, crate engines have become dirt cheap.
Strap on some big-boy pants, and slide in a GMPP 350. Then blow the
doors off all example people.
PS.
How bout some pic's?
kk
sean, from the list of mods, its clear you put considerable time & effort
into your third-gen
So my question may be a bit esoteric, but...
Why are you still chained to that pitiful 305?
Even with an "open" exhaust, when you pass by the people in your
example, I guarantee you the response will be "Ho-hum, just another
loud-mouth boat-anchor 305."
For the love of everything GM, crate engines have become dirt cheap.
Strap on some big-boy pants, and slide in a GMPP 350. Then blow the
doors off all example people.
PS.
How bout some pic's?
kk
08-22-2016, 08:59 AM
#26
Re: Need Recommendations For New Exhaust
I had a Black/w Gold stripe '85 LB9 TPI Z28 back in 1986 - 1989, I'm here to tell you that 305 would keep up with any 350 TPI Iroc. Now with that said, bigger displacement makes for a better sound, yes. The 305 can still be made to sound good with the right combination of headers, pipe, and muffler. I still think if you are going to keep the CAT, then try just pipe and no muffler.
08-22-2016, 11:37 AM
#27
Re: Need Recommendations For New Exhaust
Don't want to get sucked into the vortex of exhaust system "science"
sean, from the list of mods, its clear you put considerable time & effort
into your third-gen
So my question may be a bit esoteric, but...
Why are you still chained to that pitiful 305?
Even with an "open" exhaust, when you pass by the people in your
example, I guarantee you the response will be "Ho-hum, just another
loud-mouth boat-anchor 305."
For the love of everything GM, crate engines have become dirt cheap.
Strap on some big-boy pants, and slide in a GMPP 350. Then blow the
doors off all example people.
PS.
How bout some pic's?
kk
sean, from the list of mods, its clear you put considerable time & effort
into your third-gen
So my question may be a bit esoteric, but...
Why are you still chained to that pitiful 305?
Even with an "open" exhaust, when you pass by the people in your
example, I guarantee you the response will be "Ho-hum, just another
loud-mouth boat-anchor 305."
For the love of everything GM, crate engines have become dirt cheap.
Strap on some big-boy pants, and slide in a GMPP 350. Then blow the
doors off all example people.
PS.
How bout some pic's?
kk
That's the problem. The Goddamned L03 just jeeps going, and going, and going.
As time has passed, my interests have changed. The badass 383 I had planned would barely make more power that the base-model V8 Camaros, Mustangs, and Challengers anybody can walk in off the street and buy. My work schedule keeps me from going to test-n-tune nights, and I've realized I'm just not that interested in going fast anymore.
Since that Goddamned L03 won't die, I've decided to put a set of heads, a rumpety-assed cam, and a really loud exhaust on it. All I care about now is my experience driving the car.
It's funny, 30 years ago, I had a street Chevelle that ran 11.80s on the Nitrous (NOS to you Millenials) on street tires, with full exhaust. I've found the memories I enjoy most of that car are sitting at stop lights or idling along listening to the super-lumpy cam and turbo exhaust. I guarantee you, I'm going to put waaayyyyyy too much cam in my L03.
When it finally dies, I'll buy an L31 long block for 2 grand, pull the heads and upgrade for a massively excessive cam, and drop it in.
Until then, I'll just continue pwning lugnuts like 84 z28
08-22-2016, 11:44 AM
#28
Re: Need Recommendations For New Exhaust
I had a Black/w Gold stripe '85 LB9 TPI Z28 back in 1986 - 1989, I'm here to tell you that 305 would keep up with any 350 TPI Iroc. Now with that said, bigger displacement makes for a better sound, yes. The 305 can still be made to sound good with the right combination of headers, pipe, and muffler. I still think if you are going to keep the CAT, then try just pipe and no muffler.
It's the difference between TPI and TBI.
08-22-2016, 12:17 PM
#29
Re: Need Recommendations For New Exhaust
Last edited by red rock; 08-22-2016 at 12:21 PM.
08-22-2016, 12:38 PM
#30
Re: Need Recommendations For New Exhaust
I totally agree with you, my point was, there is nothing wrong with the 305. They are one strong little motor, that's why it won't die on you. So many people scoff at the 305, but I have had a few and know what they are capable of. With what you mentioned you plan to do with it in your previous post, you will have a nice little "sleeper" on your hands. BTW, I can talk 40+ years ago, so lets try not to date ourselves.
There are L03 fanboys on the TBI board who talk about boring and stroking their L03 ... I think they're nuts.
It has just never made sense to me to pull a perfectly-running engine out of my car. I want to get my use out of my L03 before I change it out.
08-22-2016, 04:53 PM
#31
Supreme Member
Re: Need Recommendations For New Exhaust
Looks like I hit a nerve LMFAO, don't be mad you've been running mismatched junk on your car for 13 years. I don't need to post links here to prove my point, fact is you're too dumb to google it yourself to get educated but yet brag about your mismatched engine and headers. Its about as bright as saying you picked up 3 hp from an msd box swicthing back to factory hei or gaining 10 from flipping over your air cleaner
Yeah, that's what I thought ... no proof.
You know, I've been on this forum for over 13 years. It's the best source of information for TBIs there is.
Unfortunately, it's also the best source of disinformation on TBIs there is, as well, and you are proof of that.
It's never ceased to amaze me how, even when confronted with facts and proof, people like you refuse to be moved. What's more, you come into this discussion sneering at people and insulting them.
Ignorant? The only ignorant person in this discussion is you, and you embrace your ignorance. You rub it all over yourself like a stripper with poison ivy rubs calomine lotion on her hoo haas.
I long ago got tired of dealing with people like you. No matter how many times you get pwned, you just keep popping back up. I'm not, however, going to just let you pollute my thread with your garbage.
You said:
That is absolutely, irrevocably, 100% WRONG.
This particular piece of foolishness started with an article Car Craft did back in the 90s. They took a junkyard 305 out of an El Camino (NOT an L03, NOT a TBI), put it on a dyno, and tested a number of intake, carb, and header combinations.
The headers they had the best results with had 1 5/8 primaries. They made slightly less peak hp, but more low and midrange torque than the 1 3/4 primary headers they tested.
This turned into "1 3/4 headers KILL bottom end torque on L03s!!!!" on this board, but no one ever produced any proof of it.
In the discussions that went on at the time, numerous people pointed out that the headers in the story were long-tube, equal-length, TUNED headers, not shortie headers, and there could be no comparison made between the two.
The TBI fanboys would hear none of it.
You said:
Exactly, please provide one example of someone putting 1 3/4" shortie headers on an L03 and losing torque, or horsepower. According to you, there's a wealth of information out there .... OK, prove it.
You see, 13 years ago, I put 1 3/4" primary headers on a stock L03, and not only did peak HP and torque increase, HP and torque were up at every single point of the rpm band. Everywhere.
Let me make sure you understand. At every single point in the rpm band, HP and torque were higher with the 1 3/4" primary headers than they had been with the stock exhaust manifolds.
There was no loss of torque.
1 3/4" primary shortie headers did not "kill" my L03.
You, sir, do not know what the hell you are talking about.
More importantly, you act like a jerk.
Now, prove me wrong, or STFU.
What's next, ultimate TBI mods are worth 10hp?
You know, I've been on this forum for over 13 years. It's the best source of information for TBIs there is.
Unfortunately, it's also the best source of disinformation on TBIs there is, as well, and you are proof of that.
It's never ceased to amaze me how, even when confronted with facts and proof, people like you refuse to be moved. What's more, you come into this discussion sneering at people and insulting them.
Ignorant? The only ignorant person in this discussion is you, and you embrace your ignorance. You rub it all over yourself like a stripper with poison ivy rubs calomine lotion on her hoo haas.
I long ago got tired of dealing with people like you. No matter how many times you get pwned, you just keep popping back up. I'm not, however, going to just let you pollute my thread with your garbage.
You said:
That is absolutely, irrevocably, 100% WRONG.
This particular piece of foolishness started with an article Car Craft did back in the 90s. They took a junkyard 305 out of an El Camino (NOT an L03, NOT a TBI), put it on a dyno, and tested a number of intake, carb, and header combinations.
The headers they had the best results with had 1 5/8 primaries. They made slightly less peak hp, but more low and midrange torque than the 1 3/4 primary headers they tested.
This turned into "1 3/4 headers KILL bottom end torque on L03s!!!!" on this board, but no one ever produced any proof of it.
In the discussions that went on at the time, numerous people pointed out that the headers in the story were long-tube, equal-length, TUNED headers, not shortie headers, and there could be no comparison made between the two.
The TBI fanboys would hear none of it.
You said:
Exactly, please provide one example of someone putting 1 3/4" shortie headers on an L03 and losing torque, or horsepower. According to you, there's a wealth of information out there .... OK, prove it.
You see, 13 years ago, I put 1 3/4" primary headers on a stock L03, and not only did peak HP and torque increase, HP and torque were up at every single point of the rpm band. Everywhere.
Let me make sure you understand. At every single point in the rpm band, HP and torque were higher with the 1 3/4" primary headers than they had been with the stock exhaust manifolds.
There was no loss of torque.
1 3/4" primary shortie headers did not "kill" my L03.
You, sir, do not know what the hell you are talking about.
More importantly, you act like a jerk.
Now, prove me wrong, or STFU.
What's next, ultimate TBI mods are worth 10hp?
08-23-2016, 04:16 AM
#32
Re: Need Recommendations For New Exhaust
Looks like I hit a nerve LMFAO, don't be mad you've been running mismatched junk on your car for 13 years. I don't need to post links here to prove my point, fact is you're too dumb to google it yourself to get educated but yet brag about your mismatched engine and headers. Its about as bright as saying you picked up 3 hp from an msd box swicthing back to factory hei or gaining 10 from flipping over your air cleaner
Translation: "I Googled it and got nothin'"
08-29-2016, 04:17 PM
#33
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Join Date: Feb 2000
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Car: 1989 TTA
Engine: 3.8 Turbo
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Re: Need Recommendations For New Exhaust
Damn people, this is a place to help each other out, teach and learn. Yes some people have crazy ideas but some can also be quite rude. Feel free to help people with less experience and encourage them to do some reading!!
Now that said 1 3/4 headers on a mild 305 Tbi are quite large and most likely hurting performance, As stated an engine is an air pump but that does not mean the larger the better in all cases... Matched components perform best thruout the rpm range. Go way back to the garden hose theory if you have four sections of hose of different sizes connect inline how much water can you flow. That's right to the capacity of the smallest hose
With those large headers you are probably loosing more at most RPMs than you are gaining at what the manufacturer claims you gain at 5000 to sell them to you... Average HO is more important than peak yo go fast.
I usually don't type this much as most do t like to repeatedly, good luck and read, read, read....
Now that said 1 3/4 headers on a mild 305 Tbi are quite large and most likely hurting performance, As stated an engine is an air pump but that does not mean the larger the better in all cases... Matched components perform best thruout the rpm range. Go way back to the garden hose theory if you have four sections of hose of different sizes connect inline how much water can you flow. That's right to the capacity of the smallest hose
With those large headers you are probably loosing more at most RPMs than you are gaining at what the manufacturer claims you gain at 5000 to sell them to you... Average HO is more important than peak yo go fast.
I usually don't type this much as most do t like to repeatedly, good luck and read, read, read....
Last edited by MARKT111; 08-31-2016 at 08:29 AM.
08-29-2016, 10:21 PM
#34
Re: Need Recommendations For New Exhaust
Hp and torque up at 1,500 rpm
Hp and torque up at 2,000 rpm
Hp and torque up at 2,500 rpm
Hp and torque up at 3,000 rpm
Hp and torque up at 3,500 rpm
Hp and torque up at 4,000 rpm
Hp and torque up at 4,500 rpm
Hp and torque up at 5,000 rpm
Hit speed limiter at 5,100 rpm
Again, HP was up at every point on the graph
Torque was up at every point on the graph.
I'm being so adamant and so specific because I think it is important for people who know better to stand up against disinformation.
100%, 1 3/4 primary shorty headers DID NOT kill hp, or torque on an L03.
100%, not only did they not kill it, they improved both hp and torque throughout the entire rpm band.
Hp and torque up at 2,000 rpm
Hp and torque up at 2,500 rpm
Hp and torque up at 3,000 rpm
Hp and torque up at 3,500 rpm
Hp and torque up at 4,000 rpm
Hp and torque up at 4,500 rpm
Hp and torque up at 5,000 rpm
Hit speed limiter at 5,100 rpm
Again, HP was up at every point on the graph
Torque was up at every point on the graph.
I'm being so adamant and so specific because I think it is important for people who know better to stand up against disinformation.
100%, 1 3/4 primary shorty headers DID NOT kill hp, or torque on an L03.
100%, not only did they not kill it, they improved both hp and torque throughout the entire rpm band.
08-29-2016, 10:40 PM
#35
Re: Need Recommendations For New Exhaust
It's too bad these threads get high jacked like they do with points that have nothing to do with the original post. Seems like this is happening more and more lately. So Seanof3036, have you come up with any ideas about a louder exhaust?
08-29-2016, 11:44 PM
#36
Re: Need Recommendations For New Exhaust
I really like the SLP Loudmouth/GMMG exhaust
Since I already have a custom, mandrel-bent 3" intermediate pipe, I've been thinking about buying the GMMG chambered mufflers and having my own Loudmouth made.
I've also thought about going even more extreme and making a LOUD-***mouth using some SMALL Cherry Bomb glasspacks.
I've also been thinking about going with true duals.
Problem is, all of those options require a mandrel-bender, and the nearest ones I can find are in Houston, or in Denver.
When I had my current exhaust done, I was living in Atlanta, and there were several shops with mandrel benders to choose from. I've been surprised to find there's not one nearer to me here in Tulsa.
Last edited by seanof30306; 08-30-2016 at 12:08 AM.
08-30-2016, 08:41 AM
#37
Re: Need Recommendations For New Exhaust
You can order pipe from places like Summit; https://www.summitracing.com/search?...%20bend%20pipe
08-30-2016, 12:03 PM
#38
Re: Need Recommendations For New Exhaust
You can order pipe from places like Summit; https://www.summitracing.com/search?...%20bend%20pipe
When I took the pipe off the Jeep, I could look into the pipe and see the places where it had been welded weren't smooth ... kinda defeating the whole reason for using mandrel bent pipe.
09-01-2016, 08:36 AM
#39
Re: Need Recommendations For New Exhaust
Here is the exhaust currently on the car. Overall, I think it's held up pretty well for 13 years old:
SLP dual cat y-pipe (driver's side)
SLP dual cat y-pipe (passenger side)
I had the y-pipe Jet-Hot coated along with the headers. Not pleased with the way the coating held up. Also, I think coating the y-pipe may have been a mistake. It passes too much heat along, and keeps the car from going into closed-loop longer. Who knew?
Dual Random Technologies cats
You might notice they look a little different. One of those expensive-assed Random Technologies cats failed after less than 4,000 miles. Catalyst completely blocked the pipe. I was in Houston when it failed, and had to have it replaced with what the guy had in stock.
Oh, and there are pieces of catalyst in the muffler. The rattling makes me nuts.
Note to self ... when the exhaust guy insists welding the muffler in is the best ways to go, punch him in the face.
Also, it's interesting to not that the SLP dual cat y-pipe ain't really a "Y". It stops at the cats. You gotta do your own "y".
3" mandrel-bent intermediate pipe
Flowmaster 40 Series, dual 2 1/2" tailpipes.
Glare makes it hard to see, but I have the tailpipes tucked up. I like that much better than coming straight out the back.
I've been thinking pretty hard about leaving the front of the exhaust alone, cutting out that Flowmaster, and putting in a couple of SMALL Cherry Bombs .... GMMG-style.
Maybe even going with these tips:http://www.jegs.com/i/PYPES/958/EVT10/10002/-1
SLP dual cat y-pipe (driver's side)
SLP dual cat y-pipe (passenger side)
I had the y-pipe Jet-Hot coated along with the headers. Not pleased with the way the coating held up. Also, I think coating the y-pipe may have been a mistake. It passes too much heat along, and keeps the car from going into closed-loop longer. Who knew?
Dual Random Technologies cats
You might notice they look a little different. One of those expensive-assed Random Technologies cats failed after less than 4,000 miles. Catalyst completely blocked the pipe. I was in Houston when it failed, and had to have it replaced with what the guy had in stock.
Oh, and there are pieces of catalyst in the muffler. The rattling makes me nuts.
Note to self ... when the exhaust guy insists welding the muffler in is the best ways to go, punch him in the face.
Also, it's interesting to not that the SLP dual cat y-pipe ain't really a "Y". It stops at the cats. You gotta do your own "y".
3" mandrel-bent intermediate pipe
Flowmaster 40 Series, dual 2 1/2" tailpipes.
Glare makes it hard to see, but I have the tailpipes tucked up. I like that much better than coming straight out the back.
I've been thinking pretty hard about leaving the front of the exhaust alone, cutting out that Flowmaster, and putting in a couple of SMALL Cherry Bombs .... GMMG-style.
Maybe even going with these tips:http://www.jegs.com/i/PYPES/958/EVT10/10002/-1
09-01-2016, 08:49 AM
#40
Re: Need Recommendations For New Exhaust
Those tips will keep with the Firebird theme anyway. I weld up some joints on the exhaust and use band clamps on others so you can take it apart if you have to. I just replaced my fuel pump last month, and it came apart and went back together pretty good.
09-01-2016, 09:38 AM
#41
Supreme Member
Join Date: Jun 2012
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Car: '91 Firebird Formula
Engine: SP383 Deluxe FIRST® TPI Intake
Transmission: Tremec T56
Axle/Gears: Moser 9" Eaton Truetrac Motive 3.89
Re: Need Recommendations For New Exhaust
Quote:
Originally Posted by 84 z28
Looks like I hit a nerve LMFAO, don't be mad you've been running mismatched junk on your car for 13 years. I don't need to post links here to prove my point, fact is you're too dumb to google it yourself to get educated but yet brag about your mismatched engine and headers. Its about as bright as saying you picked up 3 hp from an msd box swicthing back to factory hei or gaining 10 from flipping over your air cleaner
Wow ..... what a surprise! How did I know this was coming?
Quote:
Originally Posted by 84 z28
I don't need to post links here to prove my point
Translation: "I Googled it and got nothin'"
seanof30306, please google internet trolling. No matter what you are going to say, there will be a reply to get you going. The point is the argument itself, not the topic. It makes a troll get off on it. Cheers.
Originally Posted by 84 z28
Looks like I hit a nerve LMFAO, don't be mad you've been running mismatched junk on your car for 13 years. I don't need to post links here to prove my point, fact is you're too dumb to google it yourself to get educated but yet brag about your mismatched engine and headers. Its about as bright as saying you picked up 3 hp from an msd box swicthing back to factory hei or gaining 10 from flipping over your air cleaner
Wow ..... what a surprise! How did I know this was coming?
Quote:
Originally Posted by 84 z28
I don't need to post links here to prove my point
Translation: "I Googled it and got nothin'"
seanof30306, please google internet trolling. No matter what you are going to say, there will be a reply to get you going. The point is the argument itself, not the topic. It makes a troll get off on it. Cheers.
09-01-2016, 09:49 AM
#42
Re: Need Recommendations For New Exhaust
The guys who did my exhaust designed it well. I've had the tank and driveshaft out several times with no problems at all, and there's never been a rattle or a clank out of it.
Back when I did the exhaust, those Random Technology cats were the hot ticket. I'd been a fan of the owner's Dave Emanuel's writing back when he was at Hot Rod. I'd met him at a few test and tune nights at Atlanta Dragway and at Year One's monthly events, and he swore by them. It was my decision to use them, not the exhaust shop's recommendation.
09-01-2016, 09:50 AM
#43
Re: Need Recommendations For New Exhaust
Quote:
Originally Posted by 84 z28
Looks like I hit a nerve LMFAO, don't be mad you've been running mismatched junk on your car for 13 years. I don't need to post links here to prove my point, fact is you're too dumb to google it yourself to get educated but yet brag about your mismatched engine and headers. Its about as bright as saying you picked up 3 hp from an msd box swicthing back to factory hei or gaining 10 from flipping over your air cleaner
Wow ..... what a surprise! How did I know this was coming?
Quote:
Originally Posted by 84 z28
I don't need to post links here to prove my point
Translation: "I Googled it and got nothin'"
seanof30306, please google internet trolling. No matter what you are going to say, there will be a reply to get you going. The point is the argument itself, not the topic. It makes a troll get off on it. Cheers.
Originally Posted by 84 z28
Looks like I hit a nerve LMFAO, don't be mad you've been running mismatched junk on your car for 13 years. I don't need to post links here to prove my point, fact is you're too dumb to google it yourself to get educated but yet brag about your mismatched engine and headers. Its about as bright as saying you picked up 3 hp from an msd box swicthing back to factory hei or gaining 10 from flipping over your air cleaner
Wow ..... what a surprise! How did I know this was coming?
Quote:
Originally Posted by 84 z28
I don't need to post links here to prove my point
Translation: "I Googled it and got nothin'"
seanof30306, please google internet trolling. No matter what you are going to say, there will be a reply to get you going. The point is the argument itself, not the topic. It makes a troll get off on it. Cheers.
06-04-2017, 10:23 PM
#45
Member
Re: Need Recommendations For New Exhaust
I have a LM1 system, I added the LM2 muffler later. The only thing you need to change, other than front hookup, is to swap the two hangers in the rear (2 bolts each, and no mods needed). I went with the LM2 muffler to cut some of the high frequencies, only. I have headers. It sounds more throaty with the LM2 'muffler'. the LM1 resonator is just a 4" tube with 3" inlet and outlet. If you wanna be loud, start there...
Good luck!
Good luck!
Last edited by a62belair; 06-04-2017 at 10:27 PM. Reason: spelling
06-04-2017, 11:24 PM
#46
Supreme Member
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Join Date: Feb 2017
Location: Meriden, CT 06450
Posts: 4,030
Received 511 Likes
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Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: Need Recommendations For New Exhaust
[QUOTE=seanof30306;6069594
My only problem with the SLP 1 3/4 headers has been getting to the #6 spark plug. It takes 10 years' worth of cussing to get that plug in and out. Hands down, the most miserable thing I've ever done on this car. I've actually thought about switching to Dyno Don's headers just over that issue.[/QUOTE]
My only problem with the SLP 1 3/4 headers has been getting to the #6 spark plug. It takes 10 years' worth of cussing to get that plug in and out. Hands down, the most miserable thing I've ever done on this car. I've actually thought about switching to Dyno Don's headers just over that issue.[/QUOTE]
06-05-2017, 12:31 AM
#47
Supreme Member
iTrader: (1)
Join Date: Feb 2017
Location: Meriden, CT 06450
Posts: 4,030
Received 511 Likes
on
428 Posts
Car: 84 TA orig. 305 LG4 "H" E4ME
Engine: 334 SBC - stroked 305 M4ME Q-Jet
Transmission: upgraded 700R4 3200 stall
Axle/Gears: 10bolt 4.10 Posi w Lakewood TA Bars
Re: Need Recommendations For New Exhaust
Loud enough???
06-05-2017, 08:36 PM
#49
Re: Need Recommendations For New Exhaust
OK, so here's what I have now:
SLP 1 3/4 shortie headers
SLP dual cat y-pipe
Dual Random Technologies cats
Custom mandrel-bent 3" intermediate pipe
Flowmaster 40
I'm just bored with it. First, I'm sick and tired of the "Flowmaster sound"
Second, it's too quiet.
I want loud. I want disruptive.
I want to scare little old ladies and members of the clergy when I drive by.
I want the cop sitting in the speed trap to spill his donuts and coffee when I pass.
When I come down the street, I want car alarms going off, dogs howling, and strippers and cocktail waitresses smiling.
The closest I can come to what I'm thinking of is this awesome truck in the Cherry Bomb commercial:
Cherry Bomb Commercial Stacey David.mpg - YouTube
I want to disturb the peace!
I thought about the old SLP Loudmouth, but that was for 4th gens, and I think I read something somewhere about there being fitment problems on 3rd gens.
Besides, I've listened to some clips on youtube, and I think the SLP loudmouth may be too tame for what I want.
Suggestions?
SLP 1 3/4 shortie headers
SLP dual cat y-pipe
Dual Random Technologies cats
Custom mandrel-bent 3" intermediate pipe
Flowmaster 40
I'm just bored with it. First, I'm sick and tired of the "Flowmaster sound"
Second, it's too quiet.
I want loud. I want disruptive.
I want to scare little old ladies and members of the clergy when I drive by.
I want the cop sitting in the speed trap to spill his donuts and coffee when I pass.
When I come down the street, I want car alarms going off, dogs howling, and strippers and cocktail waitresses smiling.
The closest I can come to what I'm thinking of is this awesome truck in the Cherry Bomb commercial:
Cherry Bomb Commercial Stacey David.mpg - YouTube
I want to disturb the peace!
I thought about the old SLP Loudmouth, but that was for 4th gens, and I think I read something somewhere about there being fitment problems on 3rd gens.
Besides, I've listened to some clips on youtube, and I think the SLP loudmouth may be too tame for what I want.
Suggestions?
Next: headers, bullets and turndowns
Next: Headers mufflers and turndowns (the turndowns cause it to resonate between the road surface and the floorpan amplifying things)
Once you Y things together they get quieter.
One of my favorites has been headers, dual high flow cats, y-pipe and 3" out the back (I've had this setup split into 2 3" tailpipes also)
SLP loudmouth fits in somewhere after that...
Whatever... primary size depends on airflow, not displacement. He likely has a little too much for peak torque but is likely making a little more power with 1-3/4" tubes.
I had a Black/w Gold stripe '85 LB9 TPI Z28 back in 1986 - 1989, I'm here to tell you that 305 would keep up with any 350 TPI Iroc. Now with that said, bigger displacement makes for a better sound, yes. The 305 can still be made to sound good with the right combination of headers, pipe, and muffler. I still think if you are going to keep the CAT, then try just pipe and no muffler.
06-06-2017, 05:52 AM
#50
Re: Need Recommendations For New Exhaust
Oh, and FWIW, the SLP loudmouth fits fine on a 3rd gen. There are some differences in flanges and hangers but nothing that some minor welding won't fix (and for that matter, with very few exceptions, nothing is really a bolt on, most exhausts involve some cutting/welding to install, at least install correctly)