I am currently running an 08 GT 500 putting down abour 750 rwhp and the car definitely moves, but the sound is awful. I have american racing long tube headers and used to have american racing cats but they were blown out. Because of this, the sound is EXTREMELY raspy and I cant stand it anymore. My question though is can I tune my car to stop from blowing out the american racing high flow cats, or are there other cats that I could buy that wont get blown out? I want something to cut down the rasp so it has that deep sound that the mustangs are famous for. Any suggestions on what I can do to solve the rasp problem?