The Koni STR.T (Orange) Shock 03-10 BMW X3 / X4 (F25) - Rear is a performance shock absorber designed to provide superior ride and handling characteristics for BMW X3 and X4 vehicles from 2003 to 2010. It features a twin-tube design with a low-pressure gas charge and a unique valving system that provides a sporty, yet comfortable ride. The Koni STR.T shock is built with a corrosion-resistant, powder-coated finish and offers an easy installation process. It is also backed by a limited lifetime warranty.