This is the optional Castle Creations Mamba Monster Conversion Kit for the HPI Baja 5B and 5T Gasoline Powered Vehicles. FEATURES: Designed to use up to three 3S Lipo packs in series for 6S punch Allows the use of the Castle Creations Mamba Monster ESC and Neu Castle series 15 brushless motors No need to drill any holes or modify the bodies in any way One year limited warranty through Castle Creations beginning at date of purchase INCLUDES: Motor and ESC Mounts, Battery Hold Down Straps, Braces, Plates, 14T MOD1 Pinion Gear and Motor Pad REQUIRES: Removing engine and installing conversion kit jxs 03/23/11 ir/jxs COMMENTS: (Any special application or something it will not work with?)