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Our engineers dropped the BMW M4 down 4
aerodynamic styling
Having An Accurate
Threaded bungs accepting 1
**50-state compliance currently for 2008-2014 model years
BC Racing ER-Series Coilovers (H-14-ER) 1537 Our engineers dropped the BMWOur newest and most advanced model yet is the ER series coilover. It features large external reservoirs front and rear, separate rebound and compression adjustment and a twin piston design. The external reservoirs hold much more oil than the conventional coilovers, allowing the coilover to operate for a much longer period of time before overheating. The external reservoirs also house the secondary piston, which allows for the adjustment of