TTI exhaust too loud

Make sure what ever you get, its in the proper 18" can length. This was the original length for 340 A Bodies.

Straight through mufflers flow the best, and are actually pretty quiet IF they are used with the proper diameter pipe.

2.5" Exhaust is good for 500hp. Any more and all you are doing is making more noise.

I run Goerlich XCelerators in 18" 2.5 behind my stroker, and am pleased. Not silent, but good sounding. I had 16" 3" in/out Dynomax Superturbos and HATED them.

Also, try IMCO, which is what I believe Accurate sells.