S&S® Stealth Air Cleaner Kit Without Cover fits 2001-'17 HD® Stock EFI Big Twin (except Throttle By Wire and CVO®) Models. Increased filter area, combined with an air horn like radiused inlet and unique S&S® stinger cone to allow smoother faster air flow for more power. This kit does not include an air cleaner cover. Can be run without a cover or for a sleeper look, a stock 1999-later big twin air cleaner cover may be used. For a little more style and a high performance look, S&S® offers a number of good looking covers. Kit includes back plate, filter element, top cover, hardware, and instructions.