Performance Suspension System with 9 damping adjustments. System includes adjustable monotube gas shocks with 9 compression / rebound settings from "comfort"  to "competition", front and rear progressive rate springs to allow adjustment of vehicle ride height. Bilstein is an original equipment manufacturer for many German automakers. Quality ride, quality fitment, and quality construction. Lowers the vehicle from 30mm to 50mm (1" - 2").