The H&R 96-03 BMW 540i E39 Sport Spring is a performance spring specifically designed for the 1996-2003 BMW 540i E39 (non touring and without sport suspension). It is engineered to lower the vehicle's center of gravity, reduce body roll, and improve handling and cornering. The spring is made from high-tensile chrome-silicon steel and features a progressive rate design, which provides a comfortable ride while maintaining superior handling characteristics. This spring is an ideal solution for those looking to upgrade their suspension without sacrificing comfort.