honestly what makes a banshee fast , is porting & pipes . Garuntee'd with a nice port job you will walk on the 450r's 660's and all that garbage valve cam shit . IF your banshee can breathe and flow , Your bike will go ! And if you do alot of asphalt racing ( weather its drag racing or just ripping it ) why not go with more of a inframe drag pipe ( shearer , grr , rocket , cpi , etc.. ) . Just my opinion .....