Schnuz, if you're racing on a track with a long straight, consider the Cartrix NSX. The newer version with the 6 spoke wheels has an NC-2/5 size motor called a TX-5 that is stupid fast! It also has a Fly bar magnet just ahead of the rear axle, so it is pretty stuck down. That motor is the fastest one I've seen, like the MRRC red can but with much more torque!?! I had to take it out of the car.
