Audi RS 6

The Audi RS 6 quattro, commonly referred to as the RS6, is the highest-performing version, and top-of-the-line specification of the Audi A6, positioned above the Audi S6. It is a mid-size sports-focused executive car, produced by the high-performance private subsidiary company quattro GmbH, for Audi AG, part of the Volkswagen Group.

Both versions of the RS6 have been produced as a five-door five-seat "Avant", Audi's name for an estate car–station wagon and a four-door five-seat saloon–sedan.

Source : Wikipedia