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Brothers Performance offers a wide selection of 1999-04 Mustang mass air meters. Upgrading your Mustang mass air meter will add horsepower and help maintain an accurate air/fuel ratio. Your 1999-04 Mustang uses the mass air meter to calculate how much air is entering the engine and must be calibrated specifically for the size of injector you have on the car. Our Mustang mass airflow meters are available in a variety of calibrations to match your application.