BC Racing ER-Series Coilovers for 2015-2019 BMW M4(I-68-ER) 8021 Carbon fiber construction with a

Carbon fiber construction with a forged pattern

torque +20 ft/lbs and improve throttle response

reducing glare

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ThisQ50/Q60 intake provides a better air flow to the engine with the smooth surface tubing construction

BC Racing ER-Series Coilovers for 2015-2019 BMW M4(I-68-ER) 8021 Carbon fiber construction with aOur 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