BC Racing ER Coilovers for Hyundai Genesis Coupe 2008-2016LISTING IMAGE IS GENERIC Our External reservoir ER Series comes with separate compression and rebound damping adjustment. The ER Series coilovers bring with them the high quality and unique features seen on the BR Series and RM Series but have the additional benefit of external reservoirs and the ability to allow the end user to individually adjust and set compression and rebound damping rates.