Quiet Exhaust Setup
Thread Starter
Staging Lane
Joined: Apr 2010
Posts: 64
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Quiet Exhaust Setup Hello Everyone,
I have an HCI 1999 Camaro (5.7/LS1). My exhaust setup is currently TSP 1 7/8 LT to a true dual setup with an X pipe and 2 GMMG/Madhammer Exhaust Bullets. I love the sound however, living in California it is not very drivable lol
Anyone have recommendations for either after market cats or mufflers which could help quiet my car down? Was thinking of putting the cats/mufflers in the back after the axle, since that is where I seemingly have the most space.
Any suggestions?
Thanks in advance.
I have an HCI 1999 Camaro (5.7/LS1). My exhaust setup is currently TSP 1 7/8 LT to a true dual setup with an X pipe and 2 GMMG/Madhammer Exhaust Bullets. I love the sound however, living in California it is not very drivable lol
Anyone have recommendations for either after market cats or mufflers which could help quiet my car down? Was thinking of putting the cats/mufflers in the back after the axle, since that is where I seemingly have the most space.
Any suggestions?
Thanks in advance.
TECH Addict
Joined: Oct 2016
Posts: 2,513
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From: PDX-OR-USA
I am running a flow master "70" on my Jeep, its huge, but has way less sound volume than other flow master mufflers. Has a nice grumble at idle and doesn't let much sound out till about 3500 rpm.. I am running a 2>1 exhaust and its short....
Joined: Nov 2001
Posts: 34,663
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From: Schiller Park, ILL Member: #317
The best exhaust setup would be one that's installed and operated in a state other than CA. 
Beyond that, you'll want the largest mufflers you can fit with the greatest amount of internal packing material. Another option would be several mufflers/resonators in series (if a large case sized unit can't be fit) within the I/X-pipe area, and/or at the rear if they can be fitted there.
Beyond that, you'll want the largest mufflers you can fit with the greatest amount of internal packing material. Another option would be several mufflers/resonators in series (if a large case sized unit can't be fit) within the I/X-pipe area, and/or at the rear if they can be fitted there.
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Launching!
Joined: Feb 2018
Posts: 225
Likes: 31
From: Bismarck, ND
Quite Quiet Exhaust Setup Hello,
I agree with the above----RPMWS6 ,"Beyond that, you'll want the largest mufflers you can fit with the greatest amount of internal packing material. Another option would be several mufflers/resonators in series (if a large case sized unit can't be fit) within the I/X-pipe area, and/or at the rear if they can be fitted there."
If I understand you correctly, keep the mufflers you have and add two more.
When I replaced my faulty stock convertors, my exhaust became too loud. I had Thorley Tri flow headers, Magnaflow replacement cats, and one Dynomax Super Turbo Muffler. Which is recommended by David Vizard. With the stock cats the sound level was OK, maybe a little loud. But with the new cats it was loud. So I added a second one and it is quiet now. They are a high flowing muffler, the link below shows the internal design. I went from 2.75" pipe to a 3.0" muffler so that should of helped with the flow.
My post about the mufflers are here.
https://ls1tech.com/forums/generatio...questions.html
I know the torch welded pieces look rough, I used Stainless Steel rods and a flux but no leaks.
Hope this helps.
I agree with the above----RPMWS6 ,"Beyond that, you'll want the largest mufflers you can fit with the greatest amount of internal packing material. Another option would be several mufflers/resonators in series (if a large case sized unit can't be fit) within the I/X-pipe area, and/or at the rear if they can be fitted there."
If I understand you correctly, keep the mufflers you have and add two more.
When I replaced my faulty stock convertors, my exhaust became too loud. I had Thorley Tri flow headers, Magnaflow replacement cats, and one Dynomax Super Turbo Muffler. Which is recommended by David Vizard. With the stock cats the sound level was OK, maybe a little loud. But with the new cats it was loud. So I added a second one and it is quiet now. They are a high flowing muffler, the link below shows the internal design. I went from 2.75" pipe to a 3.0" muffler so that should of helped with the flow.
My post about the mufflers are here.
https://ls1tech.com/forums/generatio...questions.html
I know the torch welded pieces look rough, I used Stainless Steel rods and a flux but no leaks.
Hope this helps.
Last edited by Metalchipper; Dec 24, 2022 at 06:17 PM. Reason: added quote
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