Arlen Ness AN-600-026 Mini 22 Degree Air Cleaner Kit Black for Harley-Davidson Sportster 88-21Features & Benefits: * Compact performance air cleaner featuring 4. 5in. tapered air filter design and angled billet top for increased performace and leg clearance * 22 angle CNC machined billet top * Patent pending hidden breathers are o ringed at the heads and exit out the mouth of the throttle body carb to provide efficient engine breathing, eliminating the need for any external hoses or hardware * Each air filter is made from four layers of