I got my 450 today and this thing rips, it is so much better than my 400ex, powerwise, and handling compares to it wich i had 4000 in aftermarket parts on the ex. Full roll designs axis front and rear end on the 400. I rhode for 2 hours today with the bike stock, and tomarrow morning im installing the cherrybomb removing baffle and airbox lid to see the difference. For people that have already done this how much louder will my exaust be? Possibly compared to the full r4 system i had on me ex