I recently got into 2WD Mod SC Oval with MWM bodies and most of the seasoned pros in my area are running 4 Pole SCT motors in the 4800KV range... I have seen some guys run 540 sized 7.5T motors but they aren't keeping pace... at the very least I would go with the highest torque rotor that I linked before (Outlaw Gold) if you want to have a halfway decent setup, but would seriously reconsider getting a 4 Pole SCT motor unless your club is limiting to 540 motors.