Bilstein B1 (Components) Active to Passive Suspension Conversion kits allow for non-electronic dampers to be installed on vehicles equipped with factory electronic damping systems. This kit is plug and play with factory harnesses and eliminates the triggering of warning indicators caused by the removal of factory electronic dampers. Bilstein Active to Passive Conversion kit is compatible with all Bilstein performance dampers and coilover kits. All required components and instructions are included in the kit for easy installation. PartNumber : bil50-174546 Description : B1 (Components) - Active to Passive Suspension Conversion Kit Series : B1 (Components) Title : Bilstein Shock Absorbers California Proposition 65 : WARNING: Cancer & Reproductive Harm - www.P65Warnings.ca.gov Position : Front and Rear 2011 BMW 1 Series M Base L6.2979cc Suspension::Shocks and Struts 2008-2013 BMW M3 Base V8.3999cc Suspension::Shocks and Struts