The Audi A5 is a series of compact executive coupe cars produced by the German automobile manufacturer Audi since March 2007. The A5 range additionally comprises the coupe, cabriolet, and "Sportback" (a four-door hatchback with a fastback-like roofline) version of the Audi A4 saloon and estate models. Under Audi's internal platform numbering convention, the A5 is a member of the B-platform. The Audi RS 6 quattro, commonly referred to as the RS6, is a sports-focused executive car, produced by the high-performance subsidiary company Audi Sport GmbH, for Audi AG, part of the Volkswagen Group.. The first and second versions of the RS6 were produced as a five-door five-seat "Avant", Audi's name for an estate carstation wagon, and also as a four-door five-seat saloonsedan.