Does exhaust piping change the sound of the car? Does 2 1/4" backfire? I wanna have a mid-pitch sound, not too low and deep, but not high pitched either, like when I drive the car normal, it won't sound alot louder than stock, but when you let loose, it'll give a nice sound, not too low though. Should I get 2 or 2 1/4" piping? Oh yeah, and does 2 1/4 or 2.5" backfire when you let off the gas?