The Bilstein B4 2001 BMW 325i Base Wagon Rear Twintube Shock Absorber is designed to be a direct replacement for the original shock absorber on 2001 BMW 325i Base Wagons. It features a twin-tube design that provides superior damping ability and an increased level of comfort, as well as improved handling and stability. The shock absorber is made from high-quality materials and is backed by Bilstein's limited lifetime warranty.