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. 36mm Monotube Strut Assembly BMW 228i 2016-2014; 230i 2019-2017; 320i 2018-2013; 328d 2018-2014; 328i 2016-2012; 330e 2018-2016; 330i 2018-2017; 335i 2015-2012; 340i 2018-2016; 428i 2016-2014; 428i Gran Coupe 2016-2015; 430i 2019-2017; 430i Gran Coupe 2019-2017; 435i 2016-2014; 435i Gran Coupe 2016-2015; 440i 2019-2017; 440i Gran Coupe 2019-2017; ActiveHybrid 3 2015-2013