- Black anodized one-piece billet aluminum backing plate - Smooth black powder coated steel outer cover - 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 synthetic filter with a zinc plated housing - Filter requires no oil just clean rinse and re-install when servicing - 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. 93-99 Evo B.T. with CV carb (NU)