Definition of D1 grand prix

The D1 Grand Prix (Japanese: D1グランプリ in katakana, D1 guranpuri in romaji, abbreviated as D1GP and subtitled Professional Drift) is a production car drifting series from Japan. After several years of hosting amateur drifting contests, Option Magazine & Tokyo Auto Salon founder Daijiro Inada, and drifting legend Keiichi Tsuchiya hosted a professional level drifting contest in 1999 and 2000 to feed on the ever increasing skills of drifting drivers who were dominating drifting contests in various parts of Japan. In October 2000 Inada and Tsuchiya reformed the contest as a five round series. At the following year for the following round, it was the introduction of the two car tsuiou battle, a common tradition for touge races which would become popular with car enthusiasts.