Arlen Ness Method Air Cleaner for M8Forged billet aluminum air cleaner with a polycarbonate window to view the internal workings of the air intake system. Polycarbonate is hard coated for long lasting durability and protection from engine oil and UV sunlight. Radius air inlet ensures unobstructed airflow into the engine. Complete kit includes: Backing plate Forged filter housing Clear polycarbonate top High performance filter Gaskets and necessary hardware Hidden breather system: O