Features Big Sucker hidden breather technology and more filter surface area for maximum performance. Hidden breathers are O-ringed at the heads and exit out the mouth of the throttle body to provide efficient engine breathing, eliminating the need for any external hoses or hardware. Filter features a built-in inverted top to pull in air not only from all sides of the filter but also from the front, which results in more performance-gaining airflow. Filter is constructed from synthetic material that is water-resistant, which in most cases eliminates the need for a rain sock. Filter is re-usable and do not require oil, just rinse and re-use. Includes Arlen Ness forged billet cover.