Anyone done anything to deliberately quiet down their exhaust? I'm running the FieroStore OEM style exhaust on my 2.8 , and I'd actually like to quiet the car down a bit.

Quieter muffler I can put on perhaps? Or something I can put in-line?

quote Originally posted by Xanth: Anyone done anything to deliberately quiet down their exhaust? I'm running the FieroStore OEM style exhaust on my 2.8 , and I'd actually like to quiet the car down a bit. Quieter muffler I can put on perhaps? Or something I can put in-line?

have you thought about a glass pack or reanator i think that might help you out

I've found mine is far quieter if I don't drive it so hard.... but good luck with that.

Are you positive that all your connections are tight? Maybe you have a small exhaust leak somewhere?
Marc

quote Originally posted by Xanth: Anyone done anything to deliberately quiet down their exhaust? I'm running the FieroStore OEM style exhaust on my 2.8 , and I'd actually like to quiet the car down a bit. Quieter muffler I can put on perhaps? Or something I can put in-line?

One of the first signs you are getting old....

I replaced my whole exhaust due to thinking it was blown out. I bought the FS stock exhaust. Same sound. I have posted it before that I can not understand why my 88GT exhaust is louder than my 87GT. I have checked connections. The whole 9 yards. Just cannot figure it out.

If you can find an unobtrusive way to quiet it down I am "all ears". No pun intended.

[This message has been edited by sjmaye (edited 01-27-2009).]

quote Originally posted by Xanth: Anyone done anything to deliberately quiet down their exhaust? I'm running the FieroStore OEM style exhaust on my 2.8 , and I'd actually like to quiet the car down a bit. Quieter muffler I can put on perhaps? Or something I can put in-line?

If you replace your CAT with a Magnaflow 5" round muffler, it will feed a whole lot less sound to your OEM style muffler. It also has next to no restriction.

Arn

a turbo charger will also quite down the exhaust

quote Originally posted by 85GT3.4Track4spdCar: One of the first signs you are getting old....

Yeah and those huge oversized sunglassses that the old folks wear, You know the ones, they're big, square and shield all the way up to the ears, you could view a solar eclipse with them.

But seriously, you may wish to read this thread where we talked about muffler inserts and tube mufflers.

I've seen both up close at the Woodward Dream Cruise, open headers that were very mellow until you hit it, then they were authoritative. Just an alternative way of looking at exhaust noise.

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jetman
Silver 86 SE 2M6 4-speed, with "check wallet light"
Now fortified with 8 essential slices of bacon goodness

quote Originally posted by Gokart: Are you positive that all your connections are tight? Maybe you have a small exhaust leak somewhere? Marc

Its not perfect, I have found a pinhole or two giving a little spitting noise, but whats really driving me nuts is the Drone at highway speeds. Like 85GT3.4 mentioned, I'm getting old and the noise is just annoying I want to get it to a more comfortable level, as I think the exhaust noise is a detraction from the comfort of the car.

quote Originally posted by Arns85GT: If you replace your CAT with a Magnaflow 5" round muffler, it will feed a whole lot less sound to your OEM style muffler. It also has next to no restriction. Arn

Is there a muffler that looks like a Cat? If putting in a magnaflow is quieter than the cat I could give that a try, but I do believe I need to pass a visual inspection, but not a tailpipe test.

This is an interesting method from the link Jetman posted:



Though I can't remember off hand if the 88 has a straight enough section to duplicate that idea.

I also want as quiet of an exhaust as I can get. The main 3 things that I can see that would make the difference would be ..

1. Muffler
2. Length of the exhaust system
3. Insulation of the cabin

Im not sure if using 2 mufflers would make a difference or if it did, how much it would make.
Making the exhaust system longer should make it quieter but again, not sure how much difference it would make.
I have tried dampening the sound in the cabin but didnt seem to have much luck with it.

I dont think it is so much the volume as it is the pitch of the exhaust. Some tones just travel through anything.

Im used to my Caprice and the 2.8 is really loud in comparison and only time will tell how loud the 3.8 will be.

Im keeping an eye on this thread.

Steve

quote Originally posted by Pyrthian: a turbo charger will also quite down the exhaust

I call mine an "Intake vacume driven, centrifical muffling device"

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"DRIVE IT LIKE A FIERO"
'84 Fiero, engine to be determined
'87Blue GT 3.4L Swap Completed!!!!!!!! Boosted!!!!!!!
Las Vegas Fiero Club
Fiero Road Club Of Northern Nevada

turn your AM talk radio up louder

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First LX9 Fiero GT, 1987
If you can't fix it with a hammer, you've got an electrical problem
Fiero's are people too. We pay just as much attention to them, if not more than our loved ones
My Fiero Fuel Economy
Videos of My GT
Google Videos of My GT

Mine's loud and I like it. Sports cars are suposed to be rowdy.

Keep digging, Xanth. I am with you!

quote Originally posted by Xanth: Is there a muffler that looks like a Cat? If putting in a magnaflow is quieter than the cat I could give that a try, but I do believe I need to pass a visual inspection, but not a tailpipe test.

I don't know of one. If you are trying to pass any emissions test you'll want a fresh functioning CAT in place. There are guys who can tune a non-cat engine to passing standards but you don't want to bet on it. One answer is to keep a CAT on hand and put a similar length muffler in its place. You can use band clamps on either end and when it comes time to test, you simply swap the muffler for the CAT.

If you put in a muffler, don't use the cherry bomb style. They have fiberglass packing and it mats down pretty quickly and gets louder with age. The type you want has stainless steel mesh inside.

Hope this helps.

Arn

A high flow aftermarket cat will be louder than a stock style cat. Rodney Dickman sells both kinds. Do you know what kind you have on each car?

quote Originally posted by Xanth: ...but I do believe I need to pass a visual inspection, but not a tailpipe test.

You should double-check that. Here in BC any car up to (and including) '87 is only tested at the tailpipe. Visual inspection is non-critical.

quote Originally posted by jetman: But seriously, you may wish to read this thread where we talked about muffler inserts and tube mufflers.

Too bad the images are gone in that thread. (The problem with PIP not being used to post images.)

xanth if your using the stock style exhuast you could put one of those corkscrew style moroso exhausts where the CAT was to see if that you quiet it down some since we dont need emissions stuff anymore.

Get some of these





they are glass paks in the tips, so it is like adding 4 mufflers.

All I have are these and the turbo, no muffler and it is not too loud.

------------------
"DRIVE IT LIKE A FIERO"
'84 Fiero, engine to be determined
'87Blue GT 3.4L Swap Completed!!!!!!!! Boosted!!!!!!!
Las Vegas Fiero Club
Fiero Road Club Of Northern Nevada

If you are standing outside of a running Fiero and a running Cadillac, Why is the Cadillac so much more quiet? Even with both cars having N* engines, the Fiero will be much louder.

Steve

Here in Mass all cars before 96 no longer need to pass a tailpipe emissions test, but depending on the stations they may or may not bother to perform a visual check on the emissions system.

So I could easily fabricate a quick-release type deal to make a muffler/cat swappable if I need too. I currently have a universal fit cat, made by Walker.

What would be the performance impact of putting an OEM style muffler in the location of the cat? Not a high-performance straight through but a small muffler from some factory application.

Those resonator tips actually look pretty nice, where can I get ones like that?

Check out my system (for a dohc)
It consists of an ebay cat, a walker stock replacement muffler for a camaro, and a set of hedman hot tip resonator tips. Along with some crappy welding :P




It is also MUCH quieter than my previous exhaust, needless to say, it was just plain loud.


I got the tips from amazon.com for like $25 each. Great deal.

Nick

I've been looking around at various things that would fit in the location of the cat and came across these Hushpower Resonators, wonder how much difference they make?

http://store.summitracing.c...15+-162914&D=-162914

quote Originally posted by jetman: Yeah and those huge oversized sunglassses that the old folks wear, You know the ones, they're big, square and shield all the way up to the ears, you could view a solar eclipse with them. But seriously, you may wish to read this thread where we talked about muffler inserts and tube mufflers. I've seen both up close at the Woodward Dream Cruise, open headers that were very mellow until you hit it, then they were authoritative. Just an alternative way of looking at exhaust noise.

Jetman- I read the thread linked above. I was particularly interested in your post about the sound difference between your 86 4speed vs. your 87 auto. Both had new exhausts, but sounded very different. The 86 4 speed sounded fine, but 87 auto sounded like it had a big whole in the muffler.

Exactly the issue I have. My 120K mile 87GT 5speed with original exhaust sounds fine, but my 88GT auto with with the old factory or new FS original-style exhaust sounds ratty.

Some of the pics in the old thread were missing. Since your situation was so similar to mine do you have any tips for me?

These are not mine
But for example
http://store.summitracing.c...415+115&autoview=sku

On a 3800,most people run a "T" exhaust with 2 straight mufflers OR an "S" exhaust with 1 standard muffler with 1 in and 2 out.

I dont know if there is enough room but what if you ran the exhaust like the 2.8 and used 2 mufflers,1 where the Cat is and 1 in the stock location then use resonator tips?

Also, what do resonators do exactly?

Thanks, Steve

sorry if im jacking the thread but it sounded like an idea.

quote Originally posted by JumpStart: Also, what do resonators do exactly?

I actually was about to post the same question, I keep seeing resonator thrown around rather loosely when viewing various products. Some times referred to as a Resonator Muffler, or Resonator Cat, etc. Does resonator actually do anything for volume or just the sound?

As far as i knew resonators lowered the volume of the exhaust and may possibly change the sound at the same time. Some people delete resonators on newer cars with stock exhausts to make them louder so adding them should make it quieter. Resonator tips are basicly small glasspack mufflers.

If it is a small glasspack it more than likely changes the tone. As far as bringing the sound levels down inside the car, I think that the tone plays as big a part as the volume does. At the same volume some tones will not be as noticable as others. Also read that stainless steel exhaust is quieter.

What would a Cadillac muffler do?

Steve

and I thought that the Fiero OEM exhaust was really quiet. Compared to my 3800SC exhaust with the Flotech Afterburner muffler you can hardly hear it.

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, HP Tuners VCM Suite.
87GT - 3.4L Turbocharged engine, modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "

The stock system is fairly quiet. If you put in an oversized CAT it is even quieter.

The problem with resonator tips is that they quiet the system down at idle, but, when you hit the gas they bark. If you want a quieter system it is nice to not attract unwanted attention. I used to have a loud system and it attracted a cop from 1/4 mi. down the road. I was just accellerating hard and he thought I was racing by the sound of it so he came along to investigate.

The combination of a big CAT and a Camaro muffler is about as quiet as you'll want so far as I can see. The Walker mufflers are pretty quiet.

Arn

What if you replaced the Cat with another muffler?

Steve