Arlen Ness AN-18-564 Stage 1 Big Sucker Air Cleaner Kit Black for Sportster 88-21 w/EFI or CV Carburettor Requires Round Air Cleaner CoverArlen Ness Black Finish Stage I Big Sucker Kit All in one backing plate features a built in carb support and built in breather tunnels Tunnels exit at the mouth of the carb to create a virtually closed loop system Backing plate has O ring breather bolts and a radiused intake manifold Kit includes a black aluminum backing plate Team Ness high flow air filter and all necessary hardware Requires the use of an Aftermarket Round Style Lid or Endcap (sold