My '03 Cobra runs great but..... the exh sounds like a Crown Vic and it "feels" restricted. Here is my theory: SVT had to keep the power down for 1) sand bagging - '99 Fiasco, 2) help keep our insurance lower 3) felt sorry for the Corvettes. So What they did is stick on exh manifolds, 4.6L 2v cats, and 2 1/4" pipes. Whoever can do the before and after exh mods dyno numbers, get them posted.