This S&S Stealth air cleaner kit fits 1999-'06 carbureted HD big twin models (except 1999 Softail). Also fits 2001-'16 engines with Delphi EFI throttle body (except throttle by wire). Increased filter area, combined with an air horn like radiused inlet and unique S&S stinger coneto allow smoother faster air flow for more power. Kit includes back plate, filter element, top cover, chrome Air Stream teardrop cover, hardware, and instructions.