BC Racing ER Series Coilovers for 2002-2006 Acura RSX FWD (DC5)BC Racing ER Series Coilovers for the 2002 2006 Acura RSX (DC5) put race grade adjustability in reach of the serious track day driver, with independent compression and rebound tuning at every corner. Every kit is extensively tested on the RSX DC5 chassis and refined until it balances ride quality with performance the reason RSX coilovers from BC Racing are the best selling adjustable kits in their segment worldwide. ER Series kits run a linear twin