Stock exhaust for 70 gto

melsg5

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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/
 

melsg5

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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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