This S&S® Stealth air cleaner kit fits 2003-'17 HD® models equipped with a 66mm S&S® Throttle Hog throttle body. 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 peformance look, S&S® offers a number of good looking covers. Kit includes back plate, filter element, top cover, hardware, and instructions.