So one suggestion I have heard is that for the same style muffler get one that is longer and that will lessen the sound over the shorter muffler (14" vs 18") Is there any truth to the claim that a longer muffler of the exact same construction will be quieter?
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1971 GTO Convertible 455 #64 Heads, HO intake and carb with MSD HEI, RAIII exhaust manifolds and 3:55 posi
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