BC Racing BR Series Coilovers for 2003-2006 Mercedes-Benz SL500 RWDBC Racing BR Series Coilovers for the 2003 2006 Mercedes Benz SL500 are BC Racing's entry level coilover and the most popular kit in their entire lineup they offer the most accessible entry into adjustable coilover suspension without sacrificing performance, comfort, build quality, or handling. Every kit is extensively tested on the SL500 chassis and refined until it balances ride quality with performance the reason SL500 coilovers from BC Racing are