I have 3"ipes fdrom the headers back, with turbo muffler and mine sounds good? No high RPM rasspyness and not too deep to where it sounds like its passing gass when I take off.... The pipes cost me 40$ and the muffler cost me 20$ and the welding and brackets cost me 60$ = 120$, 60$ if you do it with clamps and hang it yourself.

P.S. Its not about the sound, its about the flow..... Usualy if you have a good flowing system it sounds good as well...