The 13" case length muffler will be louder. FlowTech, Thrush Welded and Flowmaster 40 are all pretty loud. I found the FlowTech and Thrush to have less interior resonance than the Flowmaster 40.
I pulled off a pair of Thrush Welded mufflers (2 chamber) and put on 13" case length AP Xlerators (people still call them Goerlich but they are AP) along with an H pipe a few years back. Bad move. I was thinking I would like a bit less noise but they are way too quiet and the H-pipe killed that "cammy" sounding idle it had with the Thrush and the Flowmasters.
My car has been in and out of the body shop and storage for the past 2 years and I really haven't driven it. When I finally picked it up at the body shop last week to bring it home, I thought it would naturally sound loud when I first heard it running again. Nope, sounded like a stock exhaust.
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Triple Black 1971 GTO
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