Hey I'm new to this site, so forgive me if you have already gone this route. I ordered my 450R in October and have had it since January. The thing rips. I installed a FMF Titanium 4 Pipe and the FMF Powerbomb Header. Customized the airbox lid (basically open) and installed the K&N airfilter. There website sugested a 122 or 125 main jet. WRONG! I now with the help of the guys at ALBA RACING changed the pilot to a #50, the main to a #190, and moved the clip on the needle down to the forth possistion. The thing kicks butt now, pulls most the way through the powerband, until I hit the rev. limiter. Changing the front sproket to a 13 tooth also helped with the bottom end. I would like to get one of the Hot Cams but I don't know whether to get the stage 1 or stage 2.. Any Ideas?