The Bilstein B6 2004 BMW X3 2.5i Rear 46mm Monotube Shock Absorber is a high-performance shock absorber designed for superior ride comfort and improved handling. It features a 46mm monotube construction with a self-adjusting deflective disc valving system, allowing for an improved response to changing road conditions. This shock absorber is designed to reduce body roll, improve steering response, and increase overall stability. It is corrosion resistant and comes with a limited lifetime warranty.