Having had quattro deemed an "unfair advantage" and thus outlawed in Trans-Am in 1988 and IMSA GTO racing in 1989 for its on-track dominance, Audi Sport turned to the German DTM series.
Developed initially as an entry-level product for the Audi brand, Volkswagen also moved to produce their own version as the Polo, and as a notchback coupe called Derby.
