M-TEC Company, Ltd., doing business as Mugen Motorsports (無限), is a Japanese company formed in 1973 by Hirotoshi Honda, the son of Honda Motor Company founder Soichiro Honda, and Masao Kimura. Mugen, meaning "without limit", "unlimited" or "vast", is an engine tuner and parts manufacturer that manufactures OEM parts such as body kits and sports exhausts for Honda. Despite the family relationship, Mugen is not, and has never been, owned by Honda Motor Company; however, Mugen owner Hirotoshi Honda has been the biggest shareholder in Honda since his father's death in 1991.

Super GT is a sports car racing series that began in 1993. Launched as the Zen Nihon GT Senshuken (全日本GT選手権), generally referred to as the All Japan Grand Touring Car Championship (JGTC), the series was renamed to Super GT in 2005. It is the top level of sports car racing in Japan.