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The Bilstein B16 (PSS9) suspension kit for 2004 Audi S4 is a direct-fit front and rear system pairing monotube dampers with matched springs tuned for the S4 to enhance handling and ride quality. Its nine-stage manual damping system changes rebound and compression with each click for precise control. The threaded, zinc-coated body allows roughly 30–50mm lowering; Triple-C coating resists corrosion and German, Nürburgring‑tested engineering underpins the kit's durability.
Bilstein B16 2004 Audi S4 Base Front and Rear Performance Suspension System
