I have JUST ENOUGH for a Dynomax cat-back. Should I save a bit more, buy a good catalytic, and use that, or keep saving for hooker or some other exhaust brand?

Is there any drone with Dynomax?
Any power increase?
Is the tone good? I listened to some sounds, but I would like your opinons

 

I have the cat back. I love it. It's subtle. Not loud, yet noticable.

My car had ~150K miles on it when I bought it, so of course there was no noticable difference from the SOTP meter.

If you click on the link in my sig you can hear mine.

And if you click on the link to my webpage, you'll read what improvement that and a K&N filter made.

 

if i were you i would save up for the HOOKER. cat-back system 3inch pipes and madrels bends.I heard it on a 350 it sounds killer.Im getting that after i get my hedman headers on.

 

I would agree on saving for the hooker, it sounds really good. Also if you don't have to pass emissions then you can ditch the convertor.

 

Emissions is coming...how soon idk...it would suck to take it off, and have to put it back on. Anyway, I would need o2 sensor simulators wouldn't I?

 

Sorry to double post , but I just realized that JEGS has hooker for 207.99, but Summit has it for 270. Is there a major difference, (muffler I'm guessing) or is it all just the same, just different prices (which I kinda doubt).

http://store.summitracing.com/produc...earchtype=ecat

thats Hooker Competition system...120 dollars.

http://store.summitracing.com/produc...earchtype=ecat

Super Competitions...260-270 dollars.

and JEGS hooker exhaust...

http://www.jegs.com/cgi-bin/ncommerc...29&prmenbr=361

What is the main differences?

 

The first one you listed is the Hooker "universal" dual exhasut setup which you don't want. The 2nd and 3rd ones are the Aerochamber catback system. It looks like Jeg's has it for $207 and Summit has it for $262. Usually they're pretty close when it comes to pricing, maybe Summit is backordered, who knows. They're the exact same kits, just different prices, so go with the one from Jeg's. If emissions is coming soon then I would leave the cat on and wait to replace it later. If you took it off you don't need an 02 sensor simulator since there is only 1 o2 sensor on our cars (at least the older ones) which is in the driver's side exhasut manifold right before the exit where it bolts onto the y-pipe. Since you have to pass emissions every year, you should keep the cat, but I would upgrade it with a hi flow catco cat. You might do a search though to see which is cheapest, I'm not up on the cat stuff since we don't need them in indiana.

 

Ok, I got 50 more dollars to go for the cat-back...Should I buy the catalytic with it, or even headers too? Well Idk about headers, I'd really like to have a 350, and wouldn't it be easier to install them while installing a 350? What should I do? I think our emissions test is a CPU hookup, not sure, but Idt were getting the tailpipe emissions, that I yet know of.

 

Ideally you could do it all at once, headers, cat and catback system. You'll notice a hp increase with just the catback, but not nearly as much as headers/cat. If you do the catback you're probably looking at 15-20hp and replaceing everything about 40-50hp. It's all pretty easy to install so there's not real reason to wait for the 350, it can be swapped out easy. Just pull the headers off (and leave everything else hooked up) and drop the 350 in, hook the headers back up and you're good to go. Of course it's up to you and depending on cash flow you might only have a few options.

 

I have the Dynomax on my V6, its pretty nice.

At idle its very quite, but when you slam on the gas, it really comes to life. Although still not as loud as flowmasters, which is a good thing IMO.

 

FIFTEEN TO TWENTY?!?!?!?! OMG I'm BUYING BUYING.

 

And how much have we smoked today?????

You're lucky if you get 5hp on a stock engine from a cat-back.

And lucky if you get 20-30hp from headers and a complete system.

Don't fill his head with "advertisement" numbers. They're all complete They all have those to key words in them ..."UP TO 20 HP"

If you built a slightly modded 350, and were choking the hell out of it... MAYBE!!! But not on a stock 305.

 

typical dyno #'s from a stock L03, aka 305 tbi, with only exhaust mods are in the 180 rwhp range. Thats about 210 flywheel hp so 40-50 flywheel hp is a pretty good estimate.

 

I hope neither of you two try to play The Price is Right.

Show me where these "typical dyno #'s" are.

 

I'll give MY 1/4 mile ET's stock, then after ALL the mods I did. Then th FWHP results from the 1/4 ET calculator at www.smokemup.com

My first time taking the car to the track...... it had ~150K miles on it, needed a tune up, new shocks, had the bone stock exhaust, etc. The car was owned by a young lady in Iowa since it was new. She did NO mods to it at all.

I took it to the track to get a bone stock baseline. The best I could run was a 17.1xx. In a 3400# car, that's 168 FWHP w/ 20% drivetrain loss according to the calculator.

I installed a Dynomax cat back & K&N filter, new tires, new shocks, gave it a tune up, and went back to the track. 16.99 was all I could get. That's 171.3 HP. A 3.3 FWHP increase.

Then I added a Jet Stage II chip, dual snorkel air cleaner, B&M shift kit, PowerTrax posi, a new Catco cat, new rear coils, and new LCA bushings.

I took it back ~1-1/2 yrs later (after all those mods and 175K miles) and ran a best of 16.53x

In a 3400# car that's 185.6 FWHP w/20% drivetrain loss.

That's a 18.6 FWHP increase. If 10-20 HP came from the cat-back (including the cat), that means that all my other mods only added between 8.6 HP to -negative- 1.4 HP, including the drivetrain upgrades.

Now we all know good and well that A LOT of the ET shaved off was from the POSI, new rear springs, and the B&M kit reducing the drivetrain loss (including wheel spin). I wish I still had the time slips so I could tell you the MPH, but I don't. They disappeared (wife cleaning house ).

But my point is that the Dynomax cat-back AND K&N filter DID NOT add but ~3 FWHP. Those are REAL WORLD results, not what Jeg's catalog says.

 

ask and you shall recieve

https://www.thirdgen.org/techbb2/sho...t=headers+lean

https://www.thirdgen.org/techbb2/sho...ghlight=dynoed

I say typical because not many people have actual dyno #'s and the ones who do with full exhaust happen to pull around 180 rwhp.

 

First off... those are 5 spds. BOTH of them.

That's a 12-15% drivetrain loss opposed to 18-20%.

Second, if you read... they did OTHER mods to the car(s). Be it timing, chips, rear end ratios, coil, etc.

Granted, they are impressive. It's always good to see progress.

I'm just trying to keep things REAL, and in a realistic perspective.

As I said..... I shaved off .6 seconds off my car WITHOUT doing a thing to the manifolds, but I don't have easy access to a dyno, so I can't show you any real dyno numbers.

I showed you what I did, and my results. Take it how you want.

IMHO, the results you showed would not be "typical" changes from ONLY headers and a cat-back. Remember, 5spds are NOT typical. Only ~12% of LO3's produced got them.

 

My tpi car has a dyno proven 184 RWHP and run 15.10`s so your calculator is way off dude and if it is that far off on the ponies it can`t give you a real estimate as to the gains.

 

The #'s I gave were corrected for a manual transmission. One dynoed 178 hp and the other dyned 181 rwhp. Assuming a 15 % loss in the drivetrain with a manual that comes out to be 210 flywheel hp and 213-214 flywheel hp. That is an increase of 40 and 44 flywheel hp. Be honest now, but how many times have you yourself even said a chip or coil does nothing for hp? I dunno about you, but they don't do much if anything, so the large majority of those gains were from the exhaust mods alone. Now you won't see nearly that gain without doing the entire exhaust. More could be gained from tuning also, but those #'s are from just slapping the exhaust on and not tuning anything. Pretty impressive if you ask me. The stock exhaust on these cars are very restrictive! I also remember you saying you had problems with your car shifting or something so your results are not entirely valid, but correct me if I'm wrong.

 

And when did I say this?

My car shifts fine. AAMOF, it barks 'em in second, sometimes 3rd.

I have a PowerTrax locking diff, so no problems there.

My car has 188K miles on it and doesn't burn or leak one drop of oil.

Mechanically, my car's fine. Appearance wise, it's nasty. It was totalled out this summer, but it still runs great and gets ~22MPG city/highway combined.

I still think that those results are atypical.

 

Who are you talking to?

 

Right here. Forgot to mention your throttle cable wasn't opening all the way either. This is not the only post you have mentioned problems before either. I could dig up plenty more but it really would be a waste of time. Thanks. Also, you say those results are "atypical." Find me some dyno results of people with full exhaust who don't have around that amount of hp. Like I said, out of the ones who have actual dyno #'s, 180 rwhp is about the norm on a 5 speed. Autos will differ slightly, but still see the same increase when corrected for drivetrain loss.

https://www.thirdgen.org/techbb2/sho...t=aj92rs+cable

 

Well, I got $100 dollars today, so my dream is almost there. I found out the 207 dollar exhaust hooker is 2 1/4" I think...DONT want that. I want some 3" stainless steel, mandrel bent exhaust. I love the SLP tone, but due to unpermitting funds, I can't buy them . However, after I finalize my decision, get a couple more dollars for the catalytic in, which I AM replacing, I'm good to go. Next after the cat-back is headers and...Y-Pipe

 

Jeez. Talk about looking up stuff from the past.

I had the car back to the track a few weeks after I fixed the throttle cable, and didn't do any better in ET nor MPH. I think I was looking for an excuse as to why my car is so slow.

I guess I got one of the "weeker" LO3's due to production tolerances. Honestly, how many of the LO3's do you really think put out EXACTLY 170 net HP?

Regardless, I think you and I are debating over nothing.

I said someone is lucky to get 20-30HP out of an entire system. You thought you proved me wrong by showing someone who had gained ~40 HP.

IMHO, which I've said NUMEROUS TIMES, which means, that it isn't fact, just my HONEST OPINION, those aren't typical results. Regardless ... IT'S A GOOD THING!!!!! I'm glad those 2, who showed their results, did so well.

It's just that I like to give people TYPICAL, AVERAGE results. Not "But this one guy got....." Or "there's two people that.."

It takes more than two to convince me. Sorry. I'm not an easy sell.

 

I understand what you are saying. I will have my own BONE STOCK track times next friday. I actually got the day off so to the track I come. I'll be sure to post my times too. My point was simply that not very many people have actual dyno #'s of 305 tbi's. I can recall maybe a handfull, but out of the ones that do and have exhaust mods for their primary mods, they seem to pull around 180 rwhp. Stock seems to be in the 150 rwhp range, give or take a few. I wish I could show you more than 2, but those are the ONLY I know of. I think it's a little more than a coincidence that the only ones who have dyno #'s have very similar results. (exhaust mods=around 180 rwhp, which equates to about a 40+ hp gain) I also remember someone on here who had before and after dyno #'s from just adding the factory tpi exhaust and gained 12 rwhp so I don't doubt that you could see 40 hp from headers and aftermarket catback on a 305 tbi. The factory tbi exhaust is crap! 2 1/4 non mandrel bent exhaust and log manifolds aren't exactly the best for performance now!

 

AJ 92rs you will have to excuse me I had read your post wring and confused some things your gains do look about right to me I was thinking you were claiming more when I posted that.

P.S. every calculator I used put my number way off of what I got when I strapped the car to the rollers.

 

here is an article done by car craft a few years back where they put on a whole system and got over 50hp at the flywheel, thats still over 40 at the wheels when you calculate it out.

just my .02

 

forgot the link

http://www.goingfaster.com/spo/carcraft325hp305.html

 

I'm going to try some stuff off that site, it sounds like what I need. Thanks.

 

I honestly wouldn't have believed it, but it does seem as though our cars really do have a crappy exhaust system. I guess I never realized it.

FWIW, I still stick by my "those are not typical results" statement, however, I'd like to add "and since the LG4/L03 are not you're typical small blocks, I can believe a ~50 HP increase with a complete exhaust upgrade."

How's that.

 

Well since I gotta buy a %$^@% water pump, exhaust will have to wait. :/ Also having idle issues.

 

Is better to cool than to blow... errrr I mean flow.

 

Hehe

 

the hooker catback is a 3" mandrel bent pipe, and i believe its stainless steel.

 

uhh.. just putting in another vote for "No" on the dynomax, just wait, get you some quality ones. Its more expencive for a reason

 

It's made of aluminized mild steel. Not as good as stainless, but it will last a long time.

 

I'm thinking of installing a new cat (probably catco or carsound) and a cat-back on 91 RS 305 TBI but don't want to be like most other Camaros in my area that have Flowmaster. So I'm thinking about the Hookers or the Edelbrock. It looks like summit has both at about the same price. I don't want loud but more than stock. Are both Hooker & Edelbrock bolt on's? Also, I read on this forum that I should get the set for the 305 HO to get the larger pipes; will those install on my stock headers? I don't have the funds to do both headers & cat/cat-back. Opinions?

 

Yes, both are bolt on's, however if you go with the larger 305 ho version there might be a little fabrication required, but nothing an exhaust shop couldn't finish for you. If you're looking for a little louder than stock, I would go with the Hooker. It's kind of quiet at idle and mid throttle, but at WOT it gets loud. It also has a unique sound. With the cat back you won't have to worry about it hooking up to the stock manifolds, it will connect just after the cat which is right after the y-pipe. Headers and a cat back will really wake your motor up, especially headers. Hedman sells headers and a y-pipe for $200 which is a good deal.

 

But the Hedman y-pipe is a 2-1/2" pipe. Wouldn't that defeat the purpose of using a 3" catback?

 

I wasn't aware that it was 2.5". It's still an improvement over the stock "T" pipe, but yes it would negate the purpose of a 3" catback. A pipe is only as good as it's smallest point... Hooker makes a 3" pipe with their 2055 headers or SLP makes one too, but it's a bit more exspensive.