Active Differential set for XB2. The initial XRAY Active Differential is a superior, adjustable front side gear differential for XB2 . . . vastly improving the buggy's rate and managing faculties. The unique design associated with the interior components using various angled segments permits the diff gears to activate on-power to boost the forward traction, which makes it quicker and easier to drive. Whilst the XRAY Active Differential is a performance choice for severe racers who wish to gain an advantage on superior rate and management, it's also of good advantage to drivers of levels that are looking a far more predictable and easy-to-drive automobile in every racing conditions. Ball-bearings maybe not included Fits: XB2, XT2