Rough Crafts Air Cleaner + Intake Filter System Hd Harley Sportster 2004-2014 Xl 883 Eliminate the biggest restriction in a Harley Sportster engine for real HP you will feel Features 4 Inch diameter filter. Billet Aluminum backing plate with internal breathing passages for super clean installation. Billet Aluminum face plate Internal breathing system - clean installation - No hoses, No oil-catchers, no brackets