The H&R 07-13 BMW X5 E70 Sport Spring is a suspension upgrade designed to improve the ride and handling of 2007-2013 BMW X5 E70 vehicles, including diesel models. It features a progressive spring rate that provides a sporty ride without sacrificing comfort. The spring is designed to work with the vehicle's self-leveling suspension, providing improved handling and stability. It is designed to lower the vehicle's ride height by 1.2 inches for a more aggressive look and improved cornering performance.