Bilstein B6 Performance dampers are a performance upgrade to OE dampers designed to be paired with the OE factory spring. These dampers offer application specific valve settings with a monotube design to bring out the best handling performance of a vehicle. Each damper is rigorously tested for quality that meets or exceeds OE standards. B6 Performance dampers will provide improved safety and handling performance with the added benefit of world-famous Bilstein quality.\nBMW 325i 2006; 328i 2011-2007; 330i 2006; 335d 2011-2009; 335i 2011-2007; 335is 2013-2011\nBMW 325i 2006, 328i 2013-2007, 330i 2006, 335d 2011-2009, 335i 2013-2007, 335is 2013-2011