Arlen Ness Big Sucker Stage 2 Air Filter Kit Twin CamEach breather is O ring sealed at the heads and routed through the backing plate Breather tubes exit inside the throttle body for a clean, integrated design Proprietary system eliminates M8 oil blow by by redirecting excess oil back into the engine Kit includes: One piece backing plate Custom breather tubes High flow performance filter Filter top Gaskets Oil reservoir All necessary mounting hardware High performance filter made from black pre oiled