- Black anodized one-piece billet aluminum backing plate - Without outer cover - Used with Ness Stage II outer covers; or any custom outer cover with a single central bolt and a minimum of 8" diameter - Not compatible with OEM outer air cleaner covers - Stage II Big Suckers feature a 20% larger filtration area than the Stage I kits - Comes with a high performance filter element with a zinc plated housing - 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. Note: See 959660 for the replacement Ness filter element.