see i was thinking the same thing. i just have a standard 14mm pipe ran all the way back.........but that may be the problem, i would like to keep the muffler on there i think it's a really good mufler but the sound i'm getting has got to go.......here's another guestion for you. i have 2 studs broke on my head, would that have anything to do for sound, besides the shitting ticking sound that comes out right there?