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To insure maximum performance, these systems utilize Bilstein's superior monotube gas shocks (rather than 1980s technology twin tubes like much of the competition coilovers). Large mono-tubes mean the largest available piston diameter for greater sensitivity and precise control.
Patented digressive piston head design and deflective valving instantly reacts to changing road conditions. The monotube design also dissipates heat more effectively than a twin tube shock for cooler, more efficient operation and longer life.
Lighter weight reduces wear and tear on suspension components. Brian's Application Notes: The PSS9 is Bilstein's 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 front and rear and even more aggressive adjustable damping. The picture shows the PSS9 with helper spring but price is for COMPLETE kit of springs, four adjustable shocks, bumpstops...everything you need.