That silemcer has a metal plate inside, i think that if you take it out, it should work better. my buddy did that on his yfz and hell it got fasterkavants said:Yeah, it's clean cause it just had a bath. I got that for like $30 on ebay. Everyone said it wouldn't work, but for $30 what the hell? It doesn't help performance much, just looks alot better! I figured if I couldn't buy the pipe I wanted I would try that out, it worked out great. The best part is I sandblasted and painted my stocker and resold it on ebay for almost $70! Got a new pipe and made money! Ain't ebay great?