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Pontiac Forum: Stock exhaust for 70 gto
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  #1  
Old November 16th, 2018, 11:44 AM
dwd70gto dwd70gto is offline
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Stock exhaust for 70 gto

I'm looking for stock exhaust system for 70 gto with stock exhaust manifolds.
I don't want flowmaster or any other after market muffler that is louder than the stock mufflers.
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Old November 16th, 2018, 01:40 PM
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melsg5 melsg5 is offline
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this company has both D and round port exhaust manifolds. For a muffler look at the Dynomax VT. It has a valve that controls the noise based upon back pressure and they cure the drone effect from many aftermarket mufflers. I have them on my GTO for many years.
https://www.ramairrestoration.com/
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Old November 16th, 2018, 02:07 PM
dwd70gto dwd70gto is offline
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I have heard of this muffler rattling because of the valve. What model number did you use if you can remember.
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Old November 16th, 2018, 06:40 PM
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I also heard the early ones rattled but I have not experienced this issue and do not remember the model number.
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Old December 14th, 2018, 03:05 PM
dwd70gto dwd70gto is offline
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Just replace the flow masters with a stock off the shelf muffler. The sound is a lot quieter. I now can hear my radio on the expressway.
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Old December 14th, 2018, 06:26 PM
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the main thing is you are happy with the result
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Old December 14th, 2018, 10:46 PM
dwd70gto dwd70gto is offline
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I like it better now. The flow masters were just to much for long hauls.
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