Zipper's MaxFlow Stage I Air Filter Upgrade Kit for Big Twin with Carb or Cable Operated Delphi EFI Fits 2009-2010 Big Twin with Carb or Cable Operated Delphi EFI Equipped with Factory Stage I Air Cleaner Kit Takes About 5 Minutes to Install 100% Washable Pleated Fabric Filter, Made from Multiple Layers of Surgical-Quality Cotton Gauze 5/8" Deeper than the Factory Performance Filter, Kit Includes Required Longer Mounting Hardware. 60% More Surface Area than the Factory Stage I Air Cleaner