I have a question on hot cams. I am looking to rebuild my top end on my 03 YZ450 and I don't know what brand or stage of hot cams to get that would get me the maximum performance out of my bike. I do a lot of dune riding. Some people are saying to mix stage 1 and stage 2 hot cams to get the best performance, but this is with a 250f, would it work with a 450 to mix them like that? and would boring out my piston to a 480 help? would I need to run race fuel with both hot cams and big bore? and what brand is the best on big bore kits?