Bilstein B12 Pro Kit - BMW F Series 4 Series 435i | 440i M235i The Audi S1 system uses

The Audi S1 system uses our Patent Pending Carbon fibre Housing which provides an aerodynamically efficient airflow path from the filter to the turbo tube

To be installed as a kit with 524212 and 988603 or 988613

is designed to perfectly fit the lines of the unique tailpipes of the Slip-On or Evolution systems

Prepreg Carbon Fibre Venturi Housing

For installing the slip-on system

Bilstein B12 Pro Kit - BMW F Series 4 Series 435i | 440i M235i The Audi S1 system usesFor vehicles with electronic suspension control The BILSTEIN B12 Pro Kit series offers the perfect start to lower your car and get that sporty driveability. The formula: Four high performance shock absorbers, four springs, best tuning and BILSTEIN expertise. A winning combination. The BILSTEIN B12 Pro Kit allows vehicles to be lowered up to 40mm. The kit has the perfect combination of sporty dynamics, aesthetics, and load bearing capacity. This