I just got an 09 yz450f. I had an 08 so not much of a change. This is what I have done so far gytr fww rekluse clutch fmf megabomb header and 4.1 exhaust fmf powerup kit barkbusters My next stuff to work on is the bar setup. I have been reading about taller bars possibly. I am also curious if anyone has played with the factory upper triple clamp mounting positions and your thoughts on them. I am also looking for help on any suspension setup help. I normally run about 100mm of sag. I am 6ft and 170-lbs probably around 180 geared up. Any tips or advice is greatly appreciated.