New take off parts. This combo is an upgrade for your Infraction Mega. 550 3900kv Spektrum motor. 100 Amp Spektrum ESC. Arrma wrap around style heat sink and fan. Aluminum adjustable Mesh motor plate. 4s Capable 50T Spur gear and slipper clutch. 08 / 32p D Style 20t pinion. 08 / 32p D Style 26t SPEED pinion. Perfect upgrade for brushed 540- and 550-size brushed motors with the same diameter and mounting pattern (vehicle must accept pinions with a 5mm bore). 5mm shaft for added durability. High-quality 4-pole sintered rotors. Includes 4mm gold plated bullet connectors. Precision ball bearings and hardened steel 5mm shaft. Fast, powerful 32-bit ARM M4 processor. Multiple options for easy programming. Smart ESC Programming Box. SmartLink USB Updating and Programmer application. Automatic LiPo low-voltage cutoff. Ideal for 4WD 1/10th – 1/8th scale surface applications running on 3s Lipo setups. Compact for easy installation in most applications. Ready to install – no soldering required. Rugged plastic case with mounting tabs. Aluminum heat sink for high efficiency. Firmware updatable through the Smart ESC Programming Box. High heat-resistant ICT connectors, backwards compatible with ECT connectors.