Hey sparky, I can tell you the difference I felt between my bike(PC) and my buddy's (FMF gnarly), his was a little stringer off the bottom and maybe a little lesss hit when it comes on the pipe. Mine has more on top and in the midrange. in really tight stuff, his requires less clutch work, but not much. On the motocross track I think the PC blows the FMF away( but the gnarly is an off road pipe) Of the guys I ride with regularly 6 have '02 CR250's and 4 have the PC pipe and shorty silencer. The only person I know that has a Doma is on an RM80 so I can't give you very much on the power, but the construction looks first rate.:)