but they are loud! 
best sounding flowmaster on ls1
12 Second Club
Joined: Sep 2005
Posts: 689
Likes: 0
From: kentucky
well most ppl on here will say flowmaster suck on this cars and i agree and also disagre .im not a fan of the 80 series crossflow mufflers on ls1 cars they seem to echo to much but i would buy flowmaster for your car only if you go with the 10 series single chamber flowmaster also known as race flows they sound wicked just go search on the video section they sound great but dont get the 80 series you want like it at least i didnt thats why i switced to true duals
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Originally Posted by CAMJAG
Anyone try the Super 40 mufflers on a true dual setup?
10 series kick ***, sound clips in sig
Launching!
Joined: Oct 2004
Posts: 214
Likes: 0
From: Chandler, AZ
I bought the FM AT catback shortly after buying the car new in June 1999. I switched from the cross-flow muffler to an SUV FM application (made my own 2OTL). No change in performance, but I decreased interior db by about 3-5 points.
