Arlen Ness Naked Stage 1 Big Sucker Air Filter For Harley Enhance your engine's performance with the Big Sucker, designed to optimize airflow for peak efficiency. With potential horsepower gains of up to 21, this kit offers a noticeable improvement in your ride. The innovative hidden breather backing plate technology eliminates external hoses for a tidy, uncluttered appearance. The durable synthetic air filter is water-resistant, reusable, and requires no oiling, providing easy maintenance and reliable performance on every trip. Features: Billet aluminum backing plate Integrated crankcase breather for a clean look Built in velocity stack for increased performance Synthetic filter element never needs oiling Note: Accepts all Arlen Ness Stage 1 custom air cleaner covers, sold separately.