Arlen Ness, Stage 1 Big Sucker air cleaner kit. Custom cover

Plain finish one-piece aluminum backing plate . Big SuckerT 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)