The Bilstein B12 2008 BMW Z4 Coupe 3.0si Front and Rear Suspension Kit is a performance-oriented suspension upgrade designed to provide improved handling, better control, and increased stability. The kit includes two front struts, two rear shocks, and four sport springs. The struts and shocks are made from monotube construction and feature Bilstein's patented digressive piston technology, which allows for a more precise damping response. The sport springs are designed to provide a lower ride height and firmer suspension tuning. This kit is designed to improve the overall driving experience of the BMW Z4 Coupe 3.0si while providing improved handling and control.