ok, I talked to my bud, asked him to give me the low down. he states that the v-force did offer better performance than stock, not like it is totally junk, but having to cut the boot was a pain. He didnt adjust the jetting either, it was left on 2. In his opinion, he feels that the Rad valve offers a better hit, especially in the low end. He still hasnt completely had the bike running fully since this past weekend it was like 98 degrees and the bikes werent running well at the track, so he says.....I will post more from what I hear from him.