Bilstein B4 2013 BMW 328i Base Convertible Rear Shock Absorber Exterior Styling>Trunks The Serrated/Swirl combination design creates

The Serrated/Swirl combination design creates intake turbulence in the combustion chamber which breaks up the fuel creating a more complete combustion cycle increasing horsepower

Designed as a direct fit installation

Injen has put it all on the table to give you the greatest intake system possible

as opposed to the shorter "Loop Replacement" products that negatively impact both

torque Brush Finished 304 Stainless Steel Construction: 3" into 2 ½" brush finished

Bilstein B4 2013 BMW 328i Base Convertible Rear Shock Absorber Exterior Styling>Trunks The Serrated/Swirl combination design createsBilstein B4 OE Replacement dampers are specifically engineered to be the best choice for maintaining the original ride quality of your vehicle, while meeting or exceeding OE standards. These dampers are the ideal choice for the driver looking to restore the original performance and handling of their vehicle, with the added benefit of world famous Bilstein quality.