what im trying to say is , its runs damn good right now.... starts on first kick,holeshots in second gear and i dont mind race gas(i run it straight in my kawi). i guess im trying to say is ive heard so many people say they hate cool heads because of the o-rings. im just not sure i want ot mes with them,but.... i do want more compression.im at 140 now--- id like to be around 165 . but... not sure if i need it, you want more compression to pull hard out of the hole. well mine pulls great !! but you dont want to much or it would hurt u on top end ,right ....