The existing MINI-Z is installed receiver, servo and ESC by 1 controlled PCB unit. But the new MR-03EVO Chassis Set has a separate receiver. By purchasing and installing an optional receiver unit depending on your transmitter, it allows for Kyosho (KT-18/EX-6/EX-6R/KT-531P/KT-432PT), KO Propo (EX-2/EX-RR) and Futaba (T7PX/T7XC/T4PM) transmitters to be used. Further, by installing a new CPU, which controls servo function only, improved the internal feedback of positioning control which is 11.2 times faster than existing VE PRO models. The new control program delivers the best ever steering feeling in MINI-Z history. The ESC also improved the response speed a maximum 100 times faster than existing VE PRO models. The included KYOSHO SPEED HOUSE XSPEED 85 (8500KV) brushless motor features a one-piece aluminum case that provides efficient heat dissipation for superior cooling. Unlike previous chassis sets, you can change to the brushed motor mode though the I.C.S manager to install an optional brushed motor. The I.C.S manager also allows more precise setting adjustments to be made. New advanced performance features in the MR-03EVO take the MINI-Z racing experience to the next level!The SP edition is equipped with nickel plated hex screws and an oil shock (MZW432) as standard. Also, the ball diff is specially finished with red anodizing. Furthermore, new upper arms with various caster angles (1 deg./2 deg./3 deg.) are included allowing wider setting range.