The Koni Special Active shock FSD for 2005–2013 BMW 3-Series (E90) RWD rear is a twin-tube low-pressure gas, non-adjustable replacement designed for the rear mounting position. It uses Koni's frequency selective damping approach to improve ride control and restore factory-style damping characteristics for this rear application, offering a direct-fit replacement with Koni-tuned hydraulic valving.
Koni Special Active Shock FSD 05-13 BMW 3-Series (E90) RWD Rear