As far as the Dynomax recommendation, what you want for quiet is the 17749 long case super turbos. I have regular 14" ones on my Catalina now and will be switching up soon after riding in a friend's 64 Catalina with the long case ones. He has a Len Williams 455, 041 cam, Rhoads lifters and long tubes. Exhaust is 3" with H pipe to the mufflers and 2.5" tailpipes out the back. The car is damn near silent inside even cruising at 3k rpm.
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