I just bought a new YZ450F and it is the most comfortable bike I have ever riden. The only downfall is the stock mufler, it has such a small tip that my bike cherpes when you give it the gas. So I bought a white Brothers Carbon pro Exhaust System with new jets, and it works so well I would recomend to anyone to put this pipe on their bike. It is loud, very good looking, and has great performance gains. My next parts will be offset 22mm RG3 triple clamps and hidson racing clutch. Riding this machine makes me feel like I can do anything I want. My personel opinion one of the best bikes on the market today. But all the new 450s are great bikes and are very closely compared, its all in the rider.