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After installing the subwoofer from OEM Audio+, Mickey proceeds to install an air-oil separator on the Mustang. The air-oil separator is beneficial because it will catch any oil or oil vapors from entering the crankcase that could cause a loss in horsepower. After installing the Ford Performance air-oil separator, Mickey gives a sneak of some new parts that will be going on the Mustang in a future video. Check it out for yourself in the video below!