Bilstein B14 Audi S4 (8E) K4 Performance Suspension System (May Req. OE 8E0412377C)

This is the Bilstein B14 PSS coilover system, specifically designed for your 2004-2009 Audi S4. If you're looking to dial in your car's stance and improve its handling dynamics, this kit is a solid choice. It replaces your factory suspension with performance dampers and matched springs, allowing you to adjust the ride height for a lower profile or a more aggressive look.

Bilstein builds these kits with their well-known monotube gas pressure technology, which helps keep the dampers cool and consistent, even during spirited driving. The threaded body is coated with a Triple-C-Technology surface finish, offering strong protection against corrosion from road salt and other elements, so it holds up well over time. You can lower your S4 by about 30mm to 50mm from its stock height, giving you the flexibility to achieve the look and feel you want. These systems are tested under demanding conditions, drawing on Bilstein's motorsport experience.

This kit is designed as a direct fit for your Audi S4, meaning it should install without major modifications. Keep in mind that some installations may require the OE 8E0412377C part, so it's a good idea to verify if your vehicle already has this or if it needs to be sourced separately. This system is a comprehensive package to upgrade your S4's suspension performance.