I have an 03 raptor with a yoshi slip on, K&N, no air box, and wanted to know which after market head pipes will bolt straight on. I know I should have bought the complete system but did not have the cash at the time. I heard the fmf or pro circuit might work. How about the gyt-r head pipe? Also any idea on dyno-jet jetting. I'm running a 144/148 now but it might be a little lean. I also do not quit understand when people say they they adjust the carb a half turn out or in, what does this do and where is this adjustment, as the instructions that came with the dyno-jet kit suck a$$.

Thanks for any help.

P.S. I know some people say a head pipe does not make a difference, but my friend just bought an 04 alba raptor with pretty much the same set up as mine, except he has the alba pipe and header, and his bike pulls a lot harder than mine, probably 3 bike lengths in 300 foot drag. We both weigh about 200 lbs.