Arlen Ness Beveled Stage 1 Big Sucker Air Cleaner Kit For Harley Unlock the full potential of your engine with the Big Sucker, engineered for optimal airflow and maximum efficiency. Dyno tests show impressive horsepower gains of up to 21 with this powerful upgrade. Its patented hidden breather backing plate technology integrates breathers directly into the air cleaner housing, ensuring a clean, streamlined appearance without external hoses or hardware. The washable, water-resistant synthetic air filter requires no oiling, offering hassle-free maintenance and long-lasting performance. Features: Billet aluminum backing plate Integrated crankcase breather for a clean look Radius air inlet for unobstructed airflow Synthetic filter element never needs oiling