One of the best on the market is the MAXFlow Air Filter Kits by Zipper’s Performance Products.
Designed to completely replace the stock air cleaner assembly, it features a 2-3/4” deep, cleanable and oilable high flow air filter element for maximum engine breathing.
These Kits are for 1999-up Big Twin Cable-Operated Delphi® EFI Models. All installation hardware and backplate are included. Zipper’s Performance Products.