Check out these 2 articles (they are the same test, just different charts):
http://www.wauknet.com/douthitt/exhaust.htm
http://www.atlantabuick.com/Mufflers.htm
See, the proof is in the pudding! Er, uh, I mean ETs
!
[NOTE: those links appear to be dead, so I am digging through my "favorites" trying to find some good links. Sit tight.]
[Edited by Chevy454 (10-19-2001 at 11:45 AM).]