Increase brake cooling without clumsy hoses and zip-ties. Alpha-N’s carbon fiber brake duct shield set (2 pcs. left + right) for the G8x M2 / M3 / M4 front brakes include an integrated scoop and duct to catch and direct incoming air from your factory brake ducts into the rotor hat where it’s most efficiently used, being pumping from the center out through the rotor vanes.