The Bilstein B14 (PSS) Suspension Kit is a race-inspired performance coilover system designed for the BMW 5 Series (E39). This kit features threaded body shocks and struts that allow for adjustable ride height, providing a lowering range of 30mm to 50mm for both front and rear axles. Engineered with Bilstein's Monotube Gas Pressure Technology, it ensures superior handling, improved stability, and a sportier aesthetic without sacrificing daily drivability. The kit is extensively road-tested under extreme conditions at the Nürburgring. Kit Contents and Part Numbers: - 2 x Front Monotube Struts (with threaded bodies) - 2 x Rear Monotube Shock Absorbers (with threaded bodies) - 4 x Performance Lowering Springs (Progressive Rate) - 2 x Front Aluminum Spring Seats - 2 x Rear Aluminum Spring Seats - 1 x Spanner Wrench Set (for height adjustment) - 4 x Dust Covers and Bump Stops