You get the new low profile high torque gear boxes that come with high rpm 280 motors. OR You get the other new high torque gear boxes and install Graupner Speed400s in them. You will have to modify the interior slightly to make them fit, they are a little longer then the originals. This will allow you to keep moving as the hits keep slowing you down. If you keep the HL board you'll definitely need a cooling fan on the transistors to keep them from blowing.