The Koni Special Active Shock FSD 12-17 BMW 3 Series F30 AWD Right Front is a performance shock absorber designed to improve ride quality and handling for BMW 3 Series F30 AWD vehicles. It features an adjustable rebound damping system, allowing the driver to fine-tune the suspension setup to their own preferences. The shock also features a Frequency Selective Damping (FSD) valve, which automatically adjusts the damping force based on the frequency of the road surface, providing a smooth, comfortable ride. With its robust construction, this shock is designed to provide superior performance and long-lasting reliability.