LEGO Technic 42099 X-Treme Off-Roader Power Functions mod with SBrick - RacingBrick
LEGO Technic 42099 4X4 X-treme Off-Roader stage 2 upgrade - even more power with only 4 extra gears! - RacingBrick
42099 Mods and Improvements - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
5 minute upgrade - turn the LEGO Technic 42099 4X4 X-treme Off-Roader into a capable crawler! - YouTube
LEGO Technic 42099 4X4 X-treme Off-Roader stage 2 upgrade - even more power with only 4 extra gears! - RacingBrick
42099 Mods and Improvements - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
Amazon.com: BRIKSMAX Led Lighting Kit for Technic 4X4 X-treme Off-Roader - Compatible with Lego 42099 Building Blocks Model- Not Include The Lego Set : Toys & Games