Stage 1 Big Sucker air cleaner kit. Custom cover

Black anodized one-piece aluminum backing plate. Big Sucker™ Stage 1 air cleaners are engineered and proven to give your engine maximum airflow for more horsepower & torque. The patented hidden breather backing plate is O-ringed at the heads and exits inside the mouth of the throttle body for a virtually closed loop system, eliminating the need for any external hoses or hardware. - Without cover - Takes all Arlen Ness Stage air cleaner covers - Takes a custom round air cleaner cover with central mount hole, minimum ID 6-1/4" (159mm) - Increases horsepower & torque - Built-in patented breathing system features hidden channels to prevent the use of unsightly exposed breather hoses and fittings - Radius air inlet for unobstructed airflow - Replacement air filter elements 959593 (Black filter) / 959597 (Red filter)