Arlen Ness 10 Gauge Inverted Series Air Cleaner Kit For Harley The 10-Gauge Inverted Series Air Cleaner Kit combines outstanding performance with striking design for V-Twin engines, featuring an inverted pleated top and sides to optimize airflow. It includes a synthetic black air filter element housed in a durable stainless steel jacket. The air filter housing features an integrated velocity stack, blending performance with aesthetics. The billet backing plate is designed with a radius inlet and patented concealed breather system for enhanced efficiency. Features: Billet aluminum backing plate Integrated crankcase breather for a clean look Radius air inlet for unobstructed airflow Synthetic filter element never needs oiling