The H&R 14-18 BMW X5 xDrive35d/X5 xDrive35i F15 Sport Spring is designed to provide improved handling and lower ride height for BMW X5 xDrive35d/X5 xDrive35i F15 models. This spring set features a progressive spring rate that provides a comfortable ride and improved cornering performance. The set is designed for use with self-leveling suspension systems and non-2WD vehicles. The spring set is constructed from high-tensile steel for long-lasting durability and performance.