Mufflers

[Lowerd1]

Also please don't say you want a V8 sound. I hate it when people say they want their V6 DOHC engine to sound like a V8 pushrod!

One sound I would love to duplicate is a Ferrari sound. I heard a Fiero with a 3.4DOHC and it sounded just like the Ferrari Race cars. It even was done up like a Ferrari Repliac. Best sounding 3.4DOHC I ever heard. Too bad I never could figure out how they did it.

Duplicating a ferrari is duplicating an engine that isnt yours...which is no better nor worse than duplicating a V8...as you said "All depends on what you like"

Not trying to be an ass, but you shouldn't hate on guys (like me) who try to make what they've been stuck with into what they want

BTW, Fiero guys actually buy Ferrari mufflers...a single muffler if I recall...might be interesting to look into!

You have some good points there. But trying to make a DOHC engine sound like a another DOHC engine, is different than trying to make a DOHC engine sound a Pushrod! Yea its trying to make a V6 sound like a V12 in the DOHC point, but its been accomplished by the Fiero crowd. I have never heard a DOHC V6 sound like a Pushrod V8! Mine only sounds like one at Idle, but get on it and you can easily tell its not a Pushrod V8!

I realize what you meant though because I was kind of asking how the Fiero guys did that. Still drives me nut to hear somebody ask how they make their 3.4L sounds like a muscle car or some Pushrod V8.

[Lowerd1]

You stink Gemmer! On the Website I have been looking at all these years it says he used a real Ferrari F355 Muffler to accomplish this sound.

http://www.gopc.com/F355/F355x.html

[Gemmer]

You stink Gemmer! On the Website I have been looking at all these years it says he used a real Ferrari F355 Muffler to accomplish this sound.

I knew I read that somewhere!!! lol

if you havn't seen em yet, watch those two all the way...thats the sound Im looking for (thanks to dykz34, kickingZ and lukez34 for the vids)

http://www.dykz34.com/other/Dave%20dyno%20sm.mov

http://lukez34.com/galleries/video/john.mov

[bubba81]

Has anyone put one muffler in place of the cat and ran dual tail pipes? It will bring up a code if you have obd2 or an o2 sensor behind the cat.

[Gemmer]

I think our O2 is in front of the cat, I dont remember...

[blk92z34getrag]

EVen if you wanted to, you probably couldn't because there isn't enough room and the muffler would hang down too low. You'd most likely scrape over bumps. I was going to do something close to this but there really isn't room.

[Gemmer]

you might be able to do something like this

http://img.photobucket.com/albums/v435/onebadgp/Catback1.jpg

(F-body exhaust on a GP)

[bubba81]

anybody got any more pics of the exhaust?

[Galen]

Bubba, first off, if your exhaust guy suggests running 2.25 all the way back, do us all a favor and run. I don't care how long he has been in business, he is a moron.

I imagine the goal of everyone on here is to get the most bang for your buck. Plain and simple, if you want to flow enough exhaust to support 250-300 whp, it is going to take a good exhaust. I would personally go with a 3 inch all the way back to a split to 2.5 inch...just because I like the look of the duels on my GTP. The duel mufflers may quiet it down a tad more, but for me it is strictly asthetics. I would also go with a good quality turbo muffler, like a DynoMax. I have heard too many bad things about the FlowMasters to go with them, but this is from the turbo community so may not apply here.

In the end, to get a good exhaust, I feel you will first have to do something about the exhaust manifold setup this motor came with factory. Either port your manifolds or build headers. Either one is gonna be a little work to get it right. Of course, if you build headers, you may as well also stick a hair dryer on there...but that is another matter all together!

Good luck! Just remember to do some research on your own and don't rely on the quality advice you will sometimes get on the internet!

Galen

Oh yea, to get some good 3 inch pipe, check with your local exhaust places and dealerships. I have gotten a ton of 3 inch exhaust systems taken off the new Hemi trucks from a friend that works at the dealerships. Evidently Dodge didn't think that a 2.5 inch exhaust was able to flow enough for their truck that puts out about 300 rwhp either.

[blk92z34getrag]

3" is huge for a 3.4L engine. You'd only want 3" pipes if you were running boost on this engine. www.magnaflow.com has a guide for what diameter is optimal for any given engine size.

By the way, my Dad's 95 GMC Safari has 3" pipes going into a 3" single-in 2.5" dual-out Magnaflow muffler with 2.25" pipes out and the engine is only 4.3L. Much less than the Hemi's.

[Galen]

ROFLMAO!!!! Did you even take the time to read the website you quoted? How much horsepower do you really want to make? I just don't know why people are afraid to so afraid to look at their goals and match the parts of their system to the goal. Even on your magnaflow website, they recommend 2.5-3 inch exhaust for a single exhaust pushing from 150-350 hp and 3-4 inch exhaust for 250-550 hp. Since my goal is in the 250-350 range, 3 inch exhaust will be it if and when I want to play with this car.

Also, don't look at boost, look at the airflow you wanna run. If you were running boost, I would probably look at 3.5 inch. By the way, my Merkur...which is pushing 23 lbs of boost on a 2.3l, is running a 3 inch exhaust right now and pushing about 275-300 rwhp. I am in the process of switching turbos/new header/new intercooler and just built the 3.5 inch downpipe for it.

Galen

[blk92z34getrag]

Did you look at the engine displacement column?

200-250 CID ~ 100 to 200hp ~ 2-1/4" to 2-1/2"

I believe our engines are 207ci?

250-300 CID ~ 150 to 250hp ~ 2-1/2" to 3"

300-350 CID ~ 200 to 350hp ~ 2-1/2" to 3"

Based on CID and / or Horsepower, we shouldn't need to run more than 2.5"

How many people are going to make over 300hp with an LQ1? How many people will get much over 250hp? Only a couple of people have successfully implemented a turbocharger in an LQ1. And most people will not even hit 300hp unless they spend thousands upon thousands of dollars on porting, polishing, boring, custom manifolds, headers, etc. I don't know how long you've owned your GP or how much you know about the W-Body aftermarket, but I hope, for your dream' sake, you are God, or else you're gonna waste a lot of 3" pipe.

[Gemmer]

EFI guys on our dual system only showed gains on a 2 1/2 to a 2 1/4 Ypipe

[bubba81]

Thanks for all the advice guys, this all helps out alot. Im going to cut the muffs off, then see how that sounds, then the resonator is coming off next, then the cat. Then i will build off from that. I want to listen and record what each step sounds like, ill post sound clips of each step when I do them.

[PlatinumZ34]

trust me, it doesn't sound good with no mufflers. Think rice...

3 inch is too big for our engines. Sure i see honda civics running around with 6 inch exhaust pipes, but im pretty sure they're garbage. It just so happens that 2.25 inches is mathematically perfect for our engine application (GM planned this out... wait, the car manufacturer knows how cars work?!?!? what!?!?)... 2.5 inches, your losing some of your lowend power (which our engines DESPERATELY need, we're talking 90hp, 100 torque from like 1200-2300 rpm) but gaining some(maybe 10) topend power.

Personally i would run 2.5" to the y and then 2.25 out, probably... maybe 2.5 all the way, maybe 2.25 all the way... All i know, is i want that damn ferrari muffler :@. And by the way, the guy who uses that F355 muffler has 325hp coming out of his LQ1 N/A (supposedly).

I personally, am going to be doing some headwork, and then i'll get it dyno'd... hopefully, let you guys know what kind of gains are possible with the heads. Exhaust is very last on my list.