This S&S® Stealth air cleaner kit for 2008-'17 HD® big twin models including 2009'17 Tri-Glide and 2011-'17 Softail CVO models, fits stock Delphi EFI throttle body. Increased filter area, combined with an air horn like radius-ed inlet and unique S&S® stinger cone result in 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.