Whipple, the leaders in innovative new products and airflow management has designed an all new, replaceable filter for the stock Ford Bronco 2.3L and 2.7L applications. Designed to increase vehicle performance by reducing airflow restriction by 17.9%. Each filter features an oiled cotton media blend for increased engine performance, velocity stack for increased airflow capacity. The replacement filter is a direct replacement to the stock paper type filter, is washable and reusable.