The Bilstein B4 2003 BMW Z4 2.5i Front Right Twintube Strut Assembly is a direct replacement for the original strut assembly on 2003 BMW Z4 2.5i models. It features a gas-pressurized monotube design that provides superior handling and stability, while the twin-tube construction helps to reduce harshness and noise. The strut assembly is designed to be corrosion resistant and features a dust boot and a boot clamp. The strut assembly also provides improved dampening control and a longer service life.