I've been running the Epic based Fantoms. They seem to have a little more torque than the standard C2 motors. In November at the Corona race, the hand out is going to be the New Reedy quad motor. I haven't run any of the adjustables yet so that's going to be interesting. The class is awesome. More power than stock, and less maintenance than mod. Kind of the best of both worlds. My XXXS has only had a stock in it once since May.