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Crazy Horse

776 Posts

Posted - 03 May 2013 :  4:18:33 PM  Show Profile  Reply with Quote
I am going with dynomax super turbo muffler for the 77 T/A. The engine is a Pontiac 455 bored 30 over. My question is, do I go with the 17748 which has a 20 inch shell? Or would the 17733 which has a 14 inch shell fit better? They both have 2 1/2 inch in/out pipe size.

Two Feathers

58 Posts

Posted - 15 Jul 2015 :  10:33:25 AM  Show Profile  Reply with Quote
Hey Paul, how are those mufflers working out? Are they quiet? Any issues?
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Blued and Painted

3505 Posts

Posted - 15 Jul 2015 :  9:30:53 PM  Show Profile  Reply with Quote
You would have trouble installing the 20's

Bull Nose Formula/ 461/ Q-Jet/
TH400/ 3.08 8.5 / R44TS.
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