i just got mine the last race of the outdoor season. has great bottom and ballistic top. the power band is real smooth as well temps were in the low 210. with about 6.5 to 7 min of run time i use a jp 4 and im sure that the crf pipes would work better with the 8mm restrictor. the os plug works but i think that it sits to far down in the combustion chamber. i checked the od 97t and it fits much better. xrc also said that the engine reaches over 40,000rpm