Arlen Ness Big Sucker Stage I Air Filter Kit for OEM Cover - Black 18-459Features a new patent pending hidden breather system and a formed aluminum internal design resulting in more performance with no oil blow by issues. The newly integrated patent pending oil catch makes sure no oil ever touches the massive perimeter flow air filter. Increases horsepower, torque & mileage Eliminates oil blow by issues associated with performance intakes on M8 engines Red pre oiled high performance filter is washable Patent pending oil