The Audi A4 is a line of compact executive cars produced since late 1994 by the German car manufacturer Audi, a subsidiary of the Volkswagen Group.
The A4 has been built in four generations and is based on the Volkswagen Group B platform. The first generation A4 succeeded the Audi 80. The automaker's internal numbering treats the A4 as a continuation of the Audi 80 lineage, with the initial A4 designated as the B5-series, followed by the B6, B7, and the current B8.
Audi Sport re-entered the Deutsche Tourenwagen Masters (DTM) series in 2004 (after having privateer teams run the Abt Sportsline Audi TT-R) with a V8 engined silhouette racing car resembling the A4 saloon, known as the Audi A4 DTM.
A4 DTM cars are identified by Audi Sport "R"-prefix designations.