Windy Is a cheetah hater he has nothing but bad luck with them LMAO Just kidding John. I have a 10mil cheetah. I have want from dune riding it in Glamis to asphalt. When the motor was Built by trinity it was a dog, Then I had it fixed by D&M a few years later. My bike only made 97 and it had the PV in it for duning, the PV made the powercruve very smooth. It was a very fun dune bike, and it ran very good. Then I wanted to start drag racing, So I had shearer port the motor and do a few other things.I took the pv's out for drag racing, bike hit the pipe alot harder. You are going to get 5 different answers it all depends on what you wanna do with the bike. There is no way in hell you will gain Hp from PV'S, If you go to any pro sand drag race you will not see a single cheetah running PV's MY bike want from 97hp Unported to 114hp ported on race gas. Now with Q16 it has made 120. If you are trail riding or dune riding keep the PV's you will have a lot more user friendly powercruve.