well i spoke to Elliot yesterday and he said they do have a set of cams for the yfz450, the price was about $430 and that is sending your stock ones in, i asked him about the gains if they are in low/midrange or mid/highrange and he said he could not answer that cause they never tried the cams alone. He told me by the time someone goes to do the cams they already have a exhaust system with aftermarket air filter and such, but one thing he did give me numbers for is for there stage 2 kit (dont know about stage 1?) it was about $2k and comes with exhaust, cams, carb and more i think, he did say that will produce around 17 more hp. I will mostlikely call sparks today and see what they say about the cams