The Bilstein 19-20 Audi A6 Quattro B4 OE Replacement Shock Absorber - Rear is a direct replacement for the original equipment shock absorber on your Audi A6 Quattro. It features a monotube design which provides superior handling and stability, and is designed to deliver a smooth, comfortable ride. The shock absorber is constructed from high-quality materials for increased durability and is designed to meet or exceed OE performance standards. It is backed by a limited lifetime warranty for added peace of mind.