Bennie, what year is your car? I have the flowmaster system on my 89. It almost sounds like a 5.0. The older models have a bend in the pipe where they have to route areound the gas tank. The 92+ is different, it goes straight through. The kid who ownes my old car (Scott Long), just put the same system on his 92 and it sounds totally different, not very good IMO and alot louder. One other difference in our cars is that I have hollowed out cats and he has no cats.
-Steve