For four years, MK8D was "complete." Then, in February 2022, Nintendo dropped the bombshell: The Booster Course Pass.
Note: The string "nsp" in your query refers to a specific file format used by the Nintendo Switch homebrew/modding scene. If you were looking for files of this nature, please note that downloading copyrighted software without ownership is illegal and violates safety policies. mariokart8deluxenspboostercoursepassdlc exclusive
The term "exclusive" in your search string likely refers to one of two things: For four years, MK8D was "complete