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Click on image for the lowdown. 
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| | | Forums66 Topics128,073 Posts1,055,908 Members48,429 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
| | | | Joined: Aug 2004 Posts: 1,067 Shop Shark | | Shop Shark Joined: Aug 2004 Posts: 1,067 | Mine do that too with Dynomax Superturbo mufflers. They're quieter at idle but boom really bad at any kind of driving speed. My solution will be to switch to Flowmaster 50 series mufflers and insulate the heck out of the cab.
52 GMC 3/4 ton pickup
68 Big Block Vette
68 455 Firebird
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