Purchased ACS springs from Vivid Racing. Springs were $735. Install was $1,535, which included alignment and mounting of original tires on original rims and swapping TPMS onto new wheels, since I upgraded wheels as well. Bought for both handling and lower ride height. My local BMW dealer did the install -- pretty extensive work since they need to remove rear seat to get to rear suspension.
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2018 BMW M4 Mineral Grey with M Competition Package / Vorsteiner 20" VFF-103 Wheels / H&R Sport Springs / CF rear diffuser /CF side skirts / CF front lip / CF splitter / CF mirror caps / CF rear spoiler / Meisterschaft GTC exhaust.
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