rcc makes some pretty good kits, i have being running a velocity stage two kit since 03 with now problem's to date, what you need to decide is what you want the kit for street or track or both,and how far you are going to push it, but what ever you do make sure it's install and tune properly by a reputable speed shop not your local bike dealer so do your research and then decide what you really want to do....i did the install myself and build the motor, carillo h-beam rods, je turbo pistons, carpenter springs, ape main bearing studs, arp head studs, hv oil pump gear, .080 spacer plate, adj. cam sprockets....these are just some of the option you might want to consider if you panl to push the kit above 6-8 psi...