I'm going to run on this year on my nypex . maybe even as short as a 156 ! Guys at mountain magic seem to like them . I have never seen one on a boosted 4 stroke yammi . think doc zooms xp 1200 doo had one on it and it seemed ok . every one has told me that you can fly down the trail with this thing and it still will keep the front end in check . I hope its not like an m10 or baker skid . i WANT to be able to wheelie over creeks and holes not lawn plow though the other bank like a dozer .