arlen ness air clnr stg1 09 19xl48 18 445Each Hidden Breather is O Ringed at the Heads and Exits at the Mouth of the Injector Carb to Provide Efficient Engine Breathing, Eliminating the Need for any external Hose or Hardware, Standard Red Filters Are Pre Oiled, Washable and Feature Four Layers AirFlow, One Piece Aluminum Backing Plate Features Patented Hidden Breather Technology, Radius Air Inlet Provides Maximum Performance by Providing Unobructed Airflow, All Necessary Hardware und