Mufflers - Pontiac GTO Forum
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post #1 of 12 (permalink) Old 02-03-2019, 12:50 PM Thread Starter
 
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Mufflers

Just wondering what mufflers people are using on their GTOs, looking for something that sounds good for my 65 389 Tripower 4 speed car.
Would like to go with something with original dimensions, any help would be greatly appreciated
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post #2 of 12 (permalink) Old 02-03-2019, 08:37 PM
 
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Originally Posted by jedi View Post
Just wondering what mufflers people are using on their GTOs, looking for something that sounds good for my 65 389 Tripower 4 speed car.
Would like to go with something with original dimensions, any help would be greatly appreciated
If you do a "Google Custom Search" in the upper right of this page, you will find a lot of examples under "Mufflers" Here are just a few:

https://www.gtoforum.com/f12/best-mu...-raiii-119481/
https://www.gtoforum.com/f154/1969-g...rience-103474/
https://www.gtoforum.com/f50/drone-m...ufflers-37775/
https://www.gtoforum.com/f154/anyone...-400-a-114706/
https://www.gtoforum.com/f12/quiet-m...choice-107330/
https://www.gtoforum.com/f12/muffler...-rumble-39773/
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post #3 of 12 (permalink) Old 02-05-2019, 02:57 PM
 
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Try Thrush turbo mufflers. I've had a pair on my car for thirty years, they have a nice low rumble. I just bought a new pair for my new Pypes system.

Joe
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post #4 of 12 (permalink) Old 02-05-2019, 11:46 PM Thread Starter
 
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Thanks for the info

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post #5 of 12 (permalink) Old 02-06-2019, 03:06 PM
 
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Years ago Jim Hand did a comprehensive muffler test on his performance oriented 455. on that combo he found Walker Turbo mufflers not only were among the top performers but also were some of the most reasonably priced. when i ran Walkers i liked their tone, aggressive but not harsh.
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post #6 of 12 (permalink) Old 03-04-2019, 07:28 PM Thread Starter
 
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Ended up ordering Magnaflow, 20 inch overall, 14 inch body. Hopefully not to loud but looking for a nice throaty sound
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post #7 of 12 (permalink) Old 03-04-2019, 09:25 PM
 
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Ended up ordering Magnaflow, 20 inch overall, 14 inch body. Hopefully not to loud but looking for a nice throaty sound
Make sure you return and let us know your exhaust manifold/pipe size combo and how you like the sound.

I used a 3" inlet/outlet Dynomax on my previous 400CI build, stock manifolds, 3" pipe with mufflers positioned just before the rear axle with turn downs. To me, they sounded great - not too deep nor too hollow sounding like some do. They did have a "drone" at about 2,500 RPM if you ran that RPM steady - which I would do because it was a tone that caught everyone's attention while cruisin' down the main boulevard. Less RPM or more RPM and the "drone" was not there. I will probably use the same set-up on my 455 build.

Placement of the muffler and tailpipes will also have an effect on sound quality. Had a 1954 Buick with a stock 322CI and put a set of Corvair Turbo mufflers in front of the trans crossmember. Gave it a really deep tone and one that got me pulled over for loud exhaust. Ran a built 409CI and ran a full exhaust using the Corvair Turbo's, 3" pipe, with tail pipes that ran into a 3 1/2" straight pipe that I ran out under the bumper. The 3 1/2" pipes amplified the sound and I got pulled over multiple times with the police officer suggesting I needed to add resonators to my legal exhaust to tone it down.

So other factors can influence the exhaust sound even if 2 cars use the same mufflers.
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post #8 of 12 (permalink) Old 03-05-2019, 08:27 AM
 
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Just wondering what mufflers people are using on their GTOs, looking for something that sounds good for my 65 389 Tripower 4 speed car.
Would like to go with something with original dimensions, any help would be greatly appreciated
I am using Black Widow Mufflers, great sound, little drone and they are made in the USA.

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post #9 of 12 (permalink) Old 03-06-2019, 07:07 PM Thread Starter
 
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Will do, probably over a month or so away though
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post #10 of 12 (permalink) Old 03-06-2019, 11:00 PM
 
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Gardner Exhaust Systems


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