Editing Audi (section)

===Touring cars===
In 1990, having completed their objective to market cars in North America, Audi returned to Europe, turning first to the [[Deutsche Tourenwagen Meisterschaft]] (DTM) series with the [[Audi V8]], and then in 1993, being unwilling to build cars for the new formula, they turned their attention to the fast-growing [[Super Touring]] series, which are a series of national championships. Audi first entered in the [[French Supertouring Championship|French Supertourisme]] and [[Italian Superturismo Championship|Italian Superturismo]]. In the following year, Audi would switch to the German [[Super Tourenwagen Cup]] (known as STW), and then to [[British Touring Car Championship]] (BTCC) the year after that.

The [[Fédération Internationale de l'Automobile]] (FIA), having difficulty regulating the quattro four-wheel drive system, and the impact it had on the competitors, would eventually ban all four-wheel drive cars from competing in the series in 1998,<ref name="Audi Motorsport">{{cite web |title=Audi at Le Mans|date=February 2012|publisher=Audi-Motorsport info|page=17|url=http://www.ausmotive.com/downloads/Audi/R18-etron-quattro-press-kit.pdf |archive-url=https://ghostarchive.org/archive/20221009/http://www.ausmotive.com/downloads/Audi/R18-etron-quattro-press-kit.pdf |archive-date=9 October 2022 |url-status=live}}</ref> but by then, Audi switched all their works efforts to [[sports car racing]].

By 2000, Audi would still compete in the US with their [[Audi RS4#B5|RS4]] for the [[SPEED World Challenge|SCCA Speed World GT Challenge]], through dealer/team [[Champion Racing]] competing against Corvettes, Vipers, and smaller BMWs (where it is one of the few series to permit 4WD cars). In 2003, Champion Racing entered an [[Audi RS6#C5|RS6]]. Once again, the quattro four-wheel drive was superior, and Champion Audi won the championship. They returned in 2004 to defend their title, but a newcomer, Cadillac with the new Omega Chassis CTS-V, gave them a run for their money. After four victories in a row, the Audis were sanctioned with several negative changes that deeply affected the car's performance. Namely, added ballast weights, and Champion Audi deciding to go with different tyres, and reducing the boost pressure of the turbocharger.

In 2004, after years of competing with the [[Audi TT|TT-R]] in the revitalised DTM series, with privateer team Abt Racing/[[Christian Abt]] taking the 2002 title with [[Laurent Aïello]], Audi returned as a full factory effort to touring car racing by entering two factory-supported [[Joest Racing]] [[Audi A4#Audi Sport A4 DTM|A4 DTM]] cars.