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The Bilstein PSS Suspension provides the ultimate in STREET performance tuning. PROGRESSIVE rate 242-282 springs provide a ride as comfortable as the factory sports package but with far less squat and dive and much more precise control. Patented digressive valving keeps the wheels on the pavement and maximizes grip over a much wider range of surface conditions for confidence and control.
Brian's Application Notes: Bilstein intends this kit as the ultimate street setup and should not be confused with the PSS9. The PSS9 is their dual purpose setup for the guy looking for something competent on street and track and it gives up some ride comfort in exchange for linear rate 343 lb springs and even more agressive adjustable damping. The picture shows the PSS9 with helper spring, the PSS uses longer 242-282 rate springs and does not need a helper spring.