The Bilstein B4 OE Replacement 11-13 BMW X3 xDrive Front Right Twintube Strut Assembly is a direct replacement for the original equipment strut assembly found in the 2011-2013 BMW X3 xDrive model. This strut assembly is designed to provide superior ride comfort and handling compared to the stock unit. It features a monotube design with a gas-pressurized construction that helps reduce aeration and foaming. The strut assembly also features a self-adjusting deflective disc valve that helps ensure consistent damping force. This product is backed by a limited lifetime warranty.