The H&R 13-15 BMW X1 xDrive28i E84 Sport Spring (AWD Only) is a performance-enhancing suspension upgrade designed to improve the handling and ride quality of the BMW X1 xDrive28i E84. The springs lower the ride height of the vehicle by approximately 1.5 in the front and 1.2 in the rear, providing a lower center of gravity and improved cornering. The Sport Springs also feature progressive rate coils that are designed to provide improved stability and control without compromising ride comfort. The springs are designed specifically for all-wheel drive (AWD) vehicles only.