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The Bilstein B12 Pro-Kit suspension kit for 1999 Audi A4 Base is a complete front-and-rear package that pairs Bilstein B8 Performance Plus dampers with Eibach Pro‑Kit springs to give a fixed, moderate lowering. Tuned per application for balanced dynamics, it lowers approximately 24–40mm depending on fitment and relies on progressive springs for precise response, predictable control and a cleaner stance.
Bilstein B12 1999 Audi A4 Base Front and Rear Suspension Kit
