youre all worng!!!!! reg yfz is faster in a drag race..see it all the time at silver lake. on an mx track they are close....now the yfz450r is better and faster all the way around...quad magazine and dirt wheels did comparisons, out of LTR450, can-am 450, yfz450R, and KTM450sx....the yfz450r won. tehy said the KTM is actually a better perfoming quad, but for the price you might as well save 4k and buy the yfz. for 4k you can easily mod it to be as good if not better than the ktm