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Replace your stock factory paper air filter with a 1999-04 Mustang K&N or Airaid high-flow direct replacement cotton element air filter to get better airflow for increased performance. These direct replacement Mustang air filters also offer better defense against dust and dirt. These hi flow replacement 1999-04 Mustang air filters are washable and reusable, meaning you save money over the lifespan of your car by replacing it just once.