Xray XB808 Active Differential
New for the Xray XB808 buggy is the unique Active Differential which is a high-performance, adjustable front gear differential that vastly improves the buggy’s speed and handling characteristics. The special design of the internal components, using different angled segments, allows the diff gears to engage on-power to increase the forward traction and stability to the buggy, making it faster and easier to drive. While this is a performance option for serious racers who want to gain an edge, it is also of great benefit to any level of driver that wants to a more predictable and easy-to-drive car in any racing conditions.
Source: Xray [teamxray.com]