Audi RS 6 GTO concept unveiled

Audi has unveiled the RS 6 GTO concept, a high-performance wagon inspired by an iconic race car of the brand's past. Based on the showroom-specification RS 6 Avant wagon, the RS 6 GTO concept pays homage to the short-lived Audi 90 Quattro GTO race car, built for the US-based IMSA racing series in 1989.