Arlen Ness, Stage 1 Big Sucker air cleaner. Knuckle

Black anodized Knuckle outer cover. With black backing plate.
Air filter element pre-oiled with red oil.
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