I was wondering what is the best 250r mx exaust set up, is it lrd, fmf, pro circuit, lrd...? and do i need an exaust flange? right now i have a very old FMF fatty pipe with a power core 2 silencer. Thanks for the help.

 

ESR, Eddie Sanders Racing makes some good ones. FTZ makes some awesome 250r circle track pipes but I don't know about their torque pipe.