The Koni Special Active Shock FSD 06-11 BMW 3 Series AWD (E90/E91) Front Left is a high-performance shock absorber designed specifically for the BMW 3 Series AWD (E90/E91). It features Koni's patented Frequency Selective Damping technology, which allows the shock to adjust to the road conditions in real time to ensure maximum comfort and handling. The shock is adjustable and can be tuned to the driver's preference, and is designed to reduce body roll, improve steering response, and reduce brake dive. It is constructed from high-quality materials and is backed by a 2-year warranty.