ExhaustPost your questions and suggestions about stock or aftermarket exhaust setups. Third Gen exhaust sound files and videos!
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That's how I ran my exhaust, except I have LTs, so it crosses under the tranny crossmember before it goes over to the passenger side, and both of my pipes exit on the passenger side. I did 2.5" pipes (the ones in the picture look like 2" or 2.25") and mine are SO close where they go over the rear end that they rattle a little bit. A single 3" pipe will flow better than any duals in stock location, and it will fit much better.
o.k. guys , check your math . those pipes are stated to be 2.250" not 2.50" . 2.250" = 2 1/4" , 2.50" = 2 1/2" . somebody slept in math class . good luck .
Thanks for all of the replies! So are you telling me that a 3" is a better idea? Won't true duals sound better? I am planning on swapping a 305 TPI for 350 TPI into my 87 this summer. I want an awesome sounding car.
I think the duals sound better, but a single pipe, a 3" or 3.5", will be cheaper and easier to install, and flow better.
Are you wanting SOUND? Or PERFORMANCE?
Duals do sound better, but also add weight to a car, while a single 3" can flow plenty for most V8 cars on the road. And most dual systems are illegal (3rd gens with the pipes running down each side). The ones like that dual kit (following the stock routing & built with dual cats) would be legal.
You want louder? Just get a bullet muffler, put it under the rear seat & do a turn out just behind the passenger door, in front of the rear tire. The lack of twists & turns over the rear axle, will definatly up the decibel level.
The weight savings of a single over dual system is negligible, unless you are worried about every last pound of weight in the car. I don't think 5-10lbs extra its going to drag 'performance' down the the level of a Yugo. There isn't a huge difference in flow either.
Single is the best route if you can't make your own exhaust. There are pleanty to chose from that sound good.
__________________ "You're never too old to learn something stupid."
- '87 Formula Firebird - never ending project
- '91 RS Camaro - *sold
- '93 Z28 - donor
- '71 Camaro LT - as if I need another project.....
- '00 S-10 Xtreme ext cab... new beater
The weight savings of a single over dual system is negligible, unless you are worried about every last pound of weight in the car. I don't think 5-10lbs extra its going to drag 'performance' down the the level of a Yugo. There isn't a huge difference in flow either.
That wasn't exactly my point, what I meant was that dual pipes weigh a lot when compared to a single pipe... almost twice as much.
On the other hand, I am one of those people that is "worried about every last pound of weight in the car".
I dont really bother with every single pound on the car it doesnt matter to me. It's not like i am going to race the car or anything. I just want a system that will flow well for a 350 and sound bad ***
That wasn't exactly my point, what I meant was that dual pipes weigh a lot when compared to a single pipe... almost twice as much.
My point is you're using the phrase 'a lot'. That implies a great or, significant amount.
I would agree with you as well, if there were 200' of exhaust pipe under an F-bod but, there isn't. You're talking about replacing roughly 8' of single pipe with 2 slightly smaller pipes.In 18ga material, that equates to just around 8 extra lbs.
That is not what I consider 'a lot' of weight.
Especially on a daily driver or, weekend cruiser.
I'm not comparing the weight of dual pipes to a number, as in '8 extra lbs', I'm comparing it to other exhaust systems. Me, being someone who is 'worried about every last pound of weight in the car', if I can reduce the weight of any system on the car by, say, 25%-50%, I will.
Now, I'll say again what I said before, duals are heavy 'when compared to' a single pipe.
I guess I can't really compare anything to the stock single pipe, most of mine had been modified in some way when I finally removed it and had it out all at once.
iroczcamaro87, you would probably like the sound of the duals the most, but you do lose some ground clearance. I have 4.25" of ground clearance, my car is at stock height. I believe I saw somewhere here, on TGO, a thread that discussed how many CFM different pipe diameters can flow, but I doubt your concerned about it that much. I'm sure dual 2.5" pipes will provide very little restriction, if any, to a mildly built 350.
If you're going to go with duals, good luck trying to find a shop that will build it for you. I checked with all of my local exhaust shops and no one would do it. The guy that ended up doing my exhaust even had an 88 Trans Am, said he's done it once and will never do it again. He now has dual side exit on his, which imo, looks horrible.
So I just had him build a custom y-pipe with 3" intermediate pipe into a Flowmaster 80 series. Gave him $400 and called it a day. Also got a set of 15" Firebird wheels in the mix too.
I'd say a single 3" would be plenty for a 350. Hell, if the 350 is going to be stock, I'd say 2.5" would be enough. Good luck!
I'm not comparing the weight of dual pipes to a number, as in '8 extra lbs', I'm comparing it to other exhaust systems. Me, being someone who is 'worried about every last pound of weight in the car', if I can reduce the weight of any system on the car by, say, 25%-50%, I will.
Now, I'll say again what I said before, duals are heavy 'when compared to' a single pipe.
I guess I can't really compare anything to the stock single pipe, most of mine had been modified in some way when I finally removed it and had it out all at once.
iroczcamaro87, you would probably like the sound of the duals the most, but you do lose some ground clearance. I have 4.25" of ground clearance, my car is at stock height. I believe I saw somewhere here, on TGO, a thread that discussed how many CFM different pipe diameters can flow, but I doubt your concerned about it that much. I'm sure dual 2.5" pipes will provide very little restriction, if any, to a mildly built 350.
I'm not comparing the weight of dual pipes to a number, as in '8 extra lbs', I'm comparing it to other exhaust systems. Me, being someone who is 'worried about every last pound of weight in the car', if I can reduce the weight of any system on the car by, say, 25%-50%, I will.
Now, I'll say again what I said before, duals are heavy 'when compared to' a single pipe.
That's probably the issue we're disagreeing on then.
In real world terms, the added weight, which is truly about 8lb... it' is not a concern for a daily driver. It's a real number and irrelevant to a DD or weekend cruiser.
In your case, I'm assuming drag racing where every gram counts (exaggeration), 8lbs is truly, 'a lot of weight'. I cannot disagree with your point of that added weight as being just that, extra, unwanted weight. I was disregarding your perspective because I wasn't looking at it from a racing point of view.
But, we're discussing real world options for the original poster.
In which case, for cost and convenience, single is the way to go, which I said.
thats how I ran mine, it was honestly a shame to have to reduce the pipes to 2" but thats the price I pay for living in Massachusetts. I thought with two cats/mufflers it would be okay but the police thought otherwise. Its running in the same exact place as the stock system that was there but with 3" pipes I lost ground clearance obviously, but I can clear all of the "legal" speed bumps, Ive scraped one that was way over 3 inchs but other than that no problem at all. No rattling either, I had plenty of room to fit two cats where the single OEM one was.
Here are some photos of my dual exhaust, and a ground clearance photo also. Dougs full length headers were used. I have a DTS 12 rear end its a bit tight getting both pipes over the axle, because its 3", a little bigger than stock http://s116.photobucket.com/albums/o...1984%20Camaro/
Here are some photos of my dual exhaust, and a ground clearance photo also. Dougs full length headers were used. I have a DTS 12 rear end its a bit tight getting both pipes over the axle, because its 3", a little bigger than stock http://s116.photobucket.com/albums/o...1984%20Camaro/
I feel sorry for the breathing of the passenger side bank to the drivers side. It has to make that major u-turn into the muffler, after the axle!
Why didn't you put both bullet mufflers before the axle? Or both bullets after the axle, but lengthwise instead of crossflow style?
Woulda given the exhaust a much straighter shot & elimimated the U-bend.
My bullet Magnaflow is under the rear seat, before the axle & is never a ground clearance problem.
my car doesnt have the red glasspacks on it those were on to get home from the shop. Ill feel sorry for u when i pass u. Thought you were cool, whats with all the negativity,show me your exhaust.
my car doesnt have the red glasspacks on it those were on to get home from the shop. Ill feel sorry for u when i pass u. Thought you were cool, whats with all the negativity,show me your exhaust.
You posted pics of those red glasspacks. I wasn't being negative. I was being real.
I could care less IF you pass me or not. That'll be up to me anyways.
A system set up like that isn't exactly a big breather, is it?
your welcome .i bought a exhaust kit from jegs , took to my buddies lift, and we went to town. there were some mandrel bends in the kit but all the others were done by heating it with a torch. it sounds awesome i got a 400 w brodix aluminum heads, and it sounded like crap through the single 3" edelbrock exhaust, the dynomax bullet mufflers are all i have . next im going to remove the gas tank put in a fuel cell , then there will be a lot more room for pipes over the axle
Thanks for all of the replies! So are you telling me that a 3" is a better idea? Won't true duals sound better? I am planning on swapping a 305 TPI for 350 TPI into my 87 this summer. I want an awesome sounding car.
For loud you could do 3inch flowmaster setup with a napa muffler delete. The install is simple. I have it on my 89 and its loud enough without sounding hollow or like garbage.
i have all stock exhaust on my 1991 350 tpi and i just put a cutout in today right before it does over the axle. sounds so much louder and more throaty i love it
Not only was this done exactly how GMMG does their Single-into dual exit exhaust (and I never heard a complaint about it unless its rasp or something silly.)
But you don't actually go over the tailpipe and think about "breathing the best." You do that so it doesn't look like dumped **** with mufflers under the car and you have more room to.. here it comes.... put some cutouts there!
Now here comes the kicker. I hate mufflers on the back of the car, ever since I saw a picture of a symmetrical setup on a 4thgen compared to a muffler-in-the-back setup. It's exactly as he put it. "A giant diaper."
I dare you to tell GMMG their setup sucks *** for "breathing", or the thousands that have bought it. Love the tough guys on this forum.
I could care less IF you pass me or not. That'll be up to me anyways.
Talking about breathing setups on mid-high horse cars.. (I would hope with all this ****-talkin...but this line..) and you could care less if he passes you? Even in a race? Man, if I had over 400RWHP I would be pissed if someone passed me. I would have to get MOAR.
What all do you exactly have done to warrant such a outstanding breathing exhaust like the TSP rumbler....
Don't go with Flowmasters..
Dual Exhaust can be done on the stock routing with shorties so easily it isn't funny and when people complain that its hard I want to whack them on the head. (A shop here in town keeps saying this about both my 3rd and 4th gen.. when I get the LT's I am going to take him to the car and gently slide the two 2.5's side by side on the passenger side in front of him and let him finish the rest in his amazement, it might kill him though.)
If you want a kit.. the best thing I can think of is this:
Hooker 2055's + YPIPE
Cut Y off Ypipe
2 90 degree turns, one extended longer than the other OFC, run these on the 2 ends of the result of the cut Y.
About 12 inches of straight tube on both back past the rocker, 2 45 degree turns into 2 24'inch pipes (probably less, I would just get that much and cut to spec.) 2 more 45's into the mufflers if you choose, or into about 40" of tubing going back to the axle.
2 90' degrees at the end of that to go up the back of the axle, 2 90degrees to get them over the axle, finish up as you see fit.
Would have just needed to wrap the brakelines and/or move them over a bit and put some clamps on it so the pipes were sturdy and sealed till it was welded up.
If I remember right, Stephen was very doubtful of mine as well.. even thought its almost an exact replica of someone else's on here and the 3rd gen dual exhaust picture site.
That whole project is set aside for now. It's being stripped to the bones.. either a 408LQ or 496 BBC. Gotta pay off the new beauty though before I can really dig in.
dynomax makes a true dual kit for third gen firebirds and camaros i found it on summit for around 170 bucks it puts both pipes though the stock location and is nice. its a bit of a pain to install and with out cutting the over axle pipies requires the use of glasspacks for ground clearance
requires the use of glasspacks for ground clearance
Why would it require glasspacks?
Glasspacks aren't the only bullet-style mufflers in existence.
I have a Magnaflow one (mounted in front of the axle).....Flowmaster makes one.....Those are the 2 manufacturers that I know of off the top of my head, but I'm positive there are plenty of others.
See post above, I fit two Moroso Spiral flow under there with plenty of clearance. Instead of that raspy sounds from the glasspacks just spend a bit more and get the Moroso. I dont know about you but I had to watch my noise level and the spiral flows were great for that, good flow and an actual "muffler", plus the case size is only 4 inchs!
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