If it where my bike i would go with a GP pipe or a nmontion pipe, and i would buy a wood's intake. Like alot of people said just do the cam mod it's free and it does gain a couple hp over the stock timing on the cam's. I my self run the wood's pipe and wood's intake, I have web cam's and the head ported by Jeff from F.A.S.T racing and that thing run's pretty good, imo...even though it is a
4 stroke ....
It's your decison either way go with what you want ever you want to run. But what ever intake and pipe you get i would highly recomend doing the cammod.
Also if you need any info on how to do it pm me...
Later Bobby