The Audi RS 6 Quattro, more commonly referred to as the RS6, is a sports-focused executive car. The first and second generations of the RS 6 were available as five-door, five-seat estate cars, and four-door, five-seat sedans. The third generation of the Audi RS 6 was only available as an Avant, the five-door, five-seat estate car. The RS 6 is a high-performance vehicle with a front-mounted engine and a Quattro four-wheel-drive system.