XMODS&reg; Evolution Stage 2 Motor Upgrade Kit Improved motor helps you achieve higher speeds and quicker acceleration Heat sink helps prevent motor from overheating, giving you longer running times and more power Compatible with Evolution cars and trucks (required) (not compatible with older XMODS) What's in the box: *Motor, *Pinion gears (6), *2nd gears (2), *Spacers (6), *2nd shaft, *Heat shink, *Removal tool You'll also need: Compatible with XMODS Evolution cars or trucks