I did the "muffler delete" on my SS 6sp. Even my wife had to admit, "that's how a Camaro should sound". Very quiet when off the throttle, very nice when on it. It should only be done with the 8 cyl 6 speed combination however. Apparently it doesn't sound good on the automatic when the fuel management feature kicks in. Two of us here in Auburn have done this, and we're both very satisfied with it. The only problem is some popping when you let off on the throttle, as the fuel control lags the throttle input slightly. I've been told that it can be corrected with some re-programming, but frankly it doesn't bother me enough to do that.