The Koni Sport (Yellow) Shock 03-09 BMW Z4 - Rear is a high performance shock absorber designed to provide superior handling, stability and a smooth ride. It is constructed from a monotube design with a gas pressurized internal chamber for improved performance and durability. The shock is adjustable in rebound and compression, allowing for fine tuning of the suspension setup. The shock is finished in a bright yellow powder coat for a unique and stylish look. This shock absorber is designed for the 2003-2009 BMW Z4 and is backed by a limited lifetime warranty.