Hi i dont' have money for a catback, so i m just gettin the plan muffler for the sound and looks. So yea i don't know which one are good? like sound wise and the looks wise cause i know magnaflow only come in 4" and OBX come in 3.5- 4 but yea i got some friend that can hook me up but i just want to know what you guys think and what people use? and experience before?