Bilstein B4 12-13 BMW 320i/328i/335i Front Twintube Strut Assembly 2009-chevrolet-silverado-2500-hd-esi4705030 Activated from inside the vehicle

Activated from inside the vehicle via a LED position control switch

Improves horsepower and torque by 18 whp and 22 ft-lbs

resulting in the ECU remaining happy

which will be slightly louder than the Supercup with the valves open and just as civilized as our Maxflo system with the valves closed

This system substantially improves exhaust tone and saves weight by replacing the restrictive factory center muffler with a lightweight high-flow x-pipe

Bilstein B4 12-13 BMW 320i/328i/335i Front Twintube Strut Assembly 2009-chevrolet-silverado-2500-hd-esi4705030 Activated from inside the vehicleBilstein 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. This Part Fits: Year Make Model Submodel 2013 2018 BMW 320i Base 2014 2018 BMW 328d Base