Arrma Metal Slipper Power Module BOOSTDetails: Even though ARRMA 4X2 BOOST and MEGA RC vehicles can accelerate to speeds of 30+ MPH in optimum conditions with their included brushed motors, at some point you'll want to go even faster and you can, when you make your RC basher brushless ready using the ARRMA Metal Slipper Power Module BOOST Box option part package. The choice of brushless motor and ESC is left to your personal preference. The ARRMA Metal Slipper Power Module BOOST Box