Well, I took my 02 WR426 out today for the first time since I installed the new cam. All I can say is, it was the best $100 bucks I could of spent. The bike starts on the first or second kick(it did before too),but now without the dumb routine and runs like a champ. I think it is deceptively faster without the big midrange hit it used to have. I rode hard big whoops all day and the thing ran like a champ. Kinda has power like my buddies CRF450 now. It could use a little bit of jetting but besides that, it is great. I highly recommend this be the first $100 you spend on your pre-03 bike. Forget the $400 exhaust, start with this, you won't be sorry.