? Effective Engine Braking and Slipper Designed to balance the slipper function and engine braking. It prevents rear-wheel lockup during downshifts, while maintaining effective engine braking for your Optimal Control. ? Maximum Acceleration, No loss of Power Designed to enhance clutch plate engagement during acceleration. This maximizing your acceleration performance. ? OEM Compatibility, Easy Installation Easy installation with your stock clutch plates and springs. Replacement clutch plates are included.