On the eve of the International Motor Show (IAA) in Frankfurt Audi presented its new DTM vehicle: After the V8 quattro (1990 to 1992) and the A4 (2004 to 2011) the brand with the four rings has opted to use a two-door coupe in the most popular international touring car series for the first time. The new Audi A5 DTM, which bears the internal project name "R17" at Audi Sport, conforms to the new Technical Regulations...