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8Free up horsepower in your 2016 - 2017 Ford Focus RS with the UPR crankcase breather kit! UPR designed this kit to remove unwanted crankcase pressure underneath your pistons during their down stroke. Utilizing a one way check ball valve, this breather kit keeps unwanted air from entering your crankcase. Four internal baffles control oil as this kit takes the place of your factory oil cap. UPR constructs the body of the valve with CNC machined billet aluminum for strength and durability that lasts. A high flow air filter clamps to the top of the valve, and the valve screws in place of your oil cap for a quick and easy installation!