With Scalloped Black anodized billet cover. Air filter element is pre-oiled with black oil. The exposed air filter element gives it good looks and excellent breathing capabilities. 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. - Increases horsepower & torque - Patented hidden breather technology - Pre-oiled high performance cotton gauze filter element - One-piece aluminum backing plate - Radius air inlet for unobstructed airflow- Replacement air filter elements 959594 (black filter) / 959598 (Red filter) - Optional rain sock 595629