First Drive: Audi RS5 TDI Concept

Can two turbos and an electric supercharger make the Audi RS5 TDI Concept a high performance diesel? We put it through its paces on a Swedish track to find out writes Geraldine Herbert What is it? Purists may baulk at the idea of a high performance turbodiesel model but not Audi. In 2006 they became the first car manufacturer to enter a TDI engine in an endurance race when they competed in Le Mans and with eight wins in nine years...