With smooth chrome billet cover. The exposed air filter element gives it good looks and excellent breathing capabilities. 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. – Replacement air filter elements 959593 (black filter) / 959597 (Red filter) – Optional rain sock 595629