650sx to 750sx to Rn Sj for me. Had tons of mods to the 750( high compresssion, bored, pipe, timing, impeller, Big carb ,etc, etc.. ) and all i have is a b-pipe, impeller, intake on the Sj, It would eat my 750 Alive.. Also i have rode a octane, felt simular to a sxr to me, very very stable...