The existing MINI-Z has a installed receiver, servo and ESC in 1 controlled PCB unit. But the new MR-03EVO Chassis Set uses a separate receiver. By purchasing and installing a receiver unit depending on your transmitter, it allows for Kyosho (EX-6R/KT-531P), KO Propo (EX-2/EX-RR), Futaba (T7PX/T7XC/T4PM), and Flysky (Noble NB4) transmitters to be used. Further, by installing new CPU which control servo function only, it improves internal feedback of positioning control which is 11.2 times faster than the previous VE PRO models. The newly developed control program realizes the best ever steering feeling in MINI-Z history. The ESC also improves the response speed a maximum of 100 times faster than existing VE PRO models. The included KYOSHO SPEED HOUSE XSPEED 56 (5600KV) brushless motor features a one-piece aluminum case that provides efficient heat dissipation for superior cooling. Unlike previous chassis sets, you can also change to brushed motor mode using the I.C.S manager to install an optional brushed motor. (82083 I.C.S. Cable required. Sold separately.) 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, SP chassis, and an oil shock (MZW432) as standard. Also, the ball diff is specially finished with blue anodizing. Furthermore, new upper arms with various caster angles (1 deg./2 deg./3 deg.) are included allowing wider setting range. The Blue Limited version features blue plastic parts throughout the chassis that are nicely coodinated with the blue anodized motor and ball diff.