I installed it yesterday. All I can say is holy crap! I still need to install my velocity intake with K&N, put my 12T Renthal front sprocket on, and Re-Jett the carb. But, with just the exhaust I am completely impressed. I damn near threw myself off the back without even trying to. I can't wait to get out to the dunes. I still need to install my yfz450 shocks also.