Just finished instaling a wb carbon pro pipe and dynojet kit on the stock v and all i can say is wow. The pipe really gave it some mid to top and the bottom even felt better. I havent installed the filter yet and dont plan on doing the 12 1in because of the extreme dust in my area. Got the jetting right on the first try thank God, so i decided to race a suzukie 400. The first time we raced on pavement I was all stock and he had a big gun exhaust. I jumped him by 2 lengths and stayed there until i hit the top, then he very slowly began creaping up on me. This race was totally different. I jumped him by a good 5 lengths and kept on pulling, Def had a higher top speed and accel. Once i add a spring, the air filter, and a chip i will post the results of the v versus a piped 450 yamaha, the way it sits i know the outcome. Hopefully the new mods will level the field