Arlen Ness Stage I Big Sucker Air Kits are the best way to improve your motorcycles performance and rideability all around. Arlen Ness Big Sucker Kits include their patented hidden breather technology as each breather is o-ringed at the heads and exits at the mouth of the throttle body making no need for external hoses or hardware for even better engine breathing. These intake kits feature the Arlen Ness Synthetic performance filters that are constructed from black synthetic filter element that is wrapped in a stainless steel jacket. Keep in mind they are washable and reusable for a long life to live and many miles to travel. Choose between various covers to complete the look for your bike or go with no cover at all. All in one backing plate features a built in throttle body support and built in breather tunnels Tunnels exit at the mouth of the throttle body to create a virtually closed loop system Backing plate has o-ring breather bolts and a radiused intake manifold Kit includes an aluminum backing plate, Team Ness high flow air filter and all necessary hardware Stage I features a tapered round air filter and a anodized black billet aluminum air filter cover with a beveled design CARB E.O. # D-639-7