BC Racing Coilovers - ER Series Coilover for 08-09 PONTIAC G8 (ZB-03-ER)BC RACING ER SERIES COILOVER KIT 08 09 PONTIAC G8 Part Number: ZB 03 ER The BC Racing ER Type Coilovers are the next phase in ultra high performance coilover systems. ER Type, or "External Reservoir" coilovers are the newest and most advanced model yet and feature large external reservoirs front and rear, separate rebound and compression adjustment and a twin piston design. The external reservoirs hold much more oil than conventional coilovers,