Go big or go home. The Arlen Ness Stage II Big Sucker Kits still retain all the performance gaining aspects for the Stage I Kits, however include a 20% larger filter for even more airflow. The kit features a one piece backing plate that is equipped with their patented hidden breather technology and radius air inlet for serious performance. This Stage II Big Sucker Kit features a synthetic black stainless steel jacketed filter element which allows you get maximize the life of the kit as it can be washed and reused for many years to come. Choose between running the kit alone without any cover and or run it with one of the Arlen Ness covers to give you a more custom feel and look. All in one backing plate features a built in carb/throttle body support and built in breather tunnels Tunnels exit at the mouth of the carb/throttle body to create a virtually closed loop system Backing plate has O-ring breather bolts and intake manifold Kit includes a aluminum backing plate, synthetic air filter, and all necessary hardware 'Big Sucker' stage II features 20% more air flow with an 7" x 2-3/4" round filter CARB E.O. # D-639-7