The Bilstein B16 (DampTronic) performance suspension system offers a manual damping overhaul for vehicles equipped with factory electronic damping control. This coilover kit features threaded body height adjustment and integrates seamlessly with the BMW factory active suspension system. The kit includes: 2x Front Performance Dampers (35-255993), 2x Rear Performance Dampers (20-256001), 4x Main Springs, 2x Front Aluminum Spring Seats, 2x Rear Threaded Height Adjusters, and a Hook Spanner Wrench Set. Designed for the xDrive models, it provides improved handling without sacrificing the convenience of electronically controlled damping.