:+1: I own the FP v-stacks myself and have yet to see a real world difference. Matter of fact with the same rider (HJ), my new 10 (w/stacks) is slower than my old 10 (w/o stacks). The old bike and rider (HJ) combo are the only pair putting a hurt'n on Pesky. (see Racing- beat Pesky thread).majtii said:would I do it again? Probably no.