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Audi signs Heinz-Harald Frentzen
- Well-known reinforcement for Audi DTM squad
- Ex-Formula 1 driver brings huge experience
- Frentzen aims for maiden DTM win in Audi A4 DTM
Audi receives a well-known reinforcement this season: Former Formula 1 driver Heinz-Harald Frentzen competes with an Audi A4 DTM in the most popular and leading international touring car race series.