I was referring to adding test pipes.
ACM by itself should sound perfect (no rasp).
I had a WS6 with cutouts a long time ago (similar to straight pipes) no rasp at all.
Originally Posted by happos2
I don't see where the rasp comes in if everything is stock and just doing the ACM mod. The rasp comes from removing resonators... The ACM mod is not raspy by itself compared to if you did the mod and resonator less. But people have differently tolerances to what is raspy and what isn't.