The Bilstein B16 1997 BMW 540i Base Front and Rear Performance Suspension System is a complete suspension upgrade for the 1997 BMW 540i. It includes four Bilstein B16 shock absorbers, four springs, and four bump stops. The shock absorbers feature a monotube design with a digressive valve that allows for a more comfortable ride at lower speeds and greater control at higher speeds. The springs are designed to provide a lower center of gravity and improved handling. The bump stops are designed to reduce body roll and improve ride comfort. The suspension system is designed to provide improved handling and control, as well as improved ride comfort.