StopTech 2015 BMW M3/M4 380mm x 30mm AeroRotor Slotted Front Rotor PairStopTech AeroRotor Replacement Kits ARK are designed to replace your vehicle's original factory rotors, while retaining the factory brake calipers. Although the ARK is the same diameter and thickness as the factory rotors, it offers improved cooling, braking, and handling. The directional, floating AeroRotors allow independent expansion of the rotor and hat without "coning," thanks to elongated drive pin holes. ARK components include AeroRotor
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StopTech 2015 BMW M3/M4 380mm x 30mm AeroRotor Slotted Front Rotor Pair