Arlen Ness Stage 1 Smooth Big Sucker Air Cleaner Kit For Harley Elevate your engine's performance with the Big Sucker, meticulously engineered to provide peak airflow and efficiency. Achieve up to a 21 increase in horsepower and experience a noticeable transformation in your ride. Its cutting-edge hidden breather backing plate technology removes the need for external hoses, resulting in a sleek and tidy installation. The durable, water-resistant synthetic air filter is designed for easy cleaning and reuse, offering consistent and reliable performance mile after mile. Features: Billet aluminum backing plate Integrated crankcase breather for a clean look Radius air inlet for unobstructed airflow Synthetic filter element never needs oiling