The Bilstein B8 Performance Plus series is a high-performance aftermarket shock absorber specifically designed to be paired with lowering springs. This 46mm Monotube gas pressure shock is engineered for drivers who demand superior handling and a sporty look without compromising safety. Features include: Monotube gas pressure technology for instant response and consistent performance; shortened stroke optimized for lowered suspensions; application-specific valve settings for the BMW X5/X6 platform. Package includes: 1x Rear Left Shock Absorber (Part No: 24-143974), 1x Mounting Nut, 1x Installation Instructions. Optimal for vehicles with sport suspension packages.