Arlen Ness Stage I Big Sucker Air Filter Kits for 1999-17 Harley Twin Cam - No Cover - 18-561 feed-mpn-6051 5" spacers are required in

5" spacers are required in the rear if you run factory wheels with a lift kit installed

2004-05 Arctic-Cat T660 Touring

2002 Polaris Magnum 500

1996 Ski-Doo Mach Z 779

it throws off the current air/fuel mixture that the vehicle is setup from the factory and tuning is STRONGLY recommended Fitment Note For your convenience

Arlen Ness Stage I Big Sucker Air Filter Kits for 1999-17 Harley Twin Cam - No Cover - 18-561 feed-mpn-6051 5" spacers are required inArlen Ness Big Sucker Air Filter Kit Part Number: 18 561 Cover Style: No Cover Back Plate: Black Anodized Style: Stage I with Red Filter Engineered and proven to give your engine maximum airflow for more horsepower & torque The Big Sucker kits are designed to be used with the stock outer air filter cover or an Arlen Ness custom outer cover One piece aluminum backing plate features patented hidden breather technology Each hidden breather is O ringed at