Arlen Ness Drift Inverted Series Air Cleaner Kit For Harley Forged from billet aluminum and CNC machined, the Arlen Ness Inverted Series Air Cleaner Kit was created to help you get the best performance out of your motorcycle. The forged billet air filter covers feature an exposed design and inverted top that acts as a velocity stack to help pull in more airflow. Patented Big Sucker hidden breather technology and the radius air inlet ensures smooth airflow. The Ness hidden breathers are O-ringed at the heads and exits at the throttle body/carb to create a virtually closed-loop system. This eliminates the need for external hoses or hardware. Pull air from every angle with the inverted, pleated top and sides. Performance filters feature a black synthetic filter and stainless-steel jacket. This water-resistant filter doesn't require any additional hardware, not even a rain sock! Features: CNC machined forged billet aluminum Inverted top pleated sides Hidden breather technology Water-resistant No additional hardware or hoses needed