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. Active to Passive Suspension Conversion Unit BMW 1 Series M 2011; M3 2013-2008 BMW 1 Series M 2011, M3 2013-2008