The Asian Touring Car Series (ATCS) is a touring car racing series that takes place each year across several Asian nations. It includes events at circuits in Malaysia, China and Indonesia. It ran as the Asian Touring Car Championship (ATCC) between 2000-2001, and 2005-2006. The championship consists of three classes. Division 1 uses cars built to Super 2000 or BTC Touring regulations. Proton provides the only factory team, whose main opposition is the independent German BMW team of Engstler Motorsport. Division 2 uses Super Production regulations for cars with engine capacities of not more than 2000cc. Engstler Motorsport has a single entry in this class and is the main competition to the four-car line-up of DTM Bel’Air Racing from Hong Kong. Division 3 is a 1600cc class and is the most production-based of the three. Only DTM Bel’Air Racing fielded entries in this class during 2006.