Lots of things would sound good. From my experience at the track, almost any decently built mustang sounds good. Its kinda wierd (must be part of their firing order). Sure flowmasters would sound great but if it were me, I'd venture to try something different. I have flowmaster original 40's and I do like them quite a bit, however if I had it to do over again I would have gone with something different. EVERYONE at our local track is running those. Sure my truck sounds very aggressive but you cant really tell it apart from the 60 other cars there lol. There are so many exhaust companies out there . . . most of whom have equal if not better flow/performance numbers than flowmaster, I dont see why they should be getting all the attention. Dont get me wrong they are a good muffler . . . but they have an even better advertising department.