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The Audi S6 is the high performance variant of the Audi A6, an executive car produced by German automaker Audi. It went on sale in 1994, shortly after the "A6" designation was introduced, replacing the "100" nameplate.The original S6 (Ur-S6) was largely the same car as the outgoing, original Audi S4 (C4) (Ur-S4), with the only visible differences being new body-cladding and badging.
Initial release. The A7 is in essence, a four door fastback version of the C7-series Audi A6, based on the Volkswagen Group MLB platform.The A7 was released before the more conventional A6 saloon/estate. Both cars share the same core structure, drivetrain, chassis, dashboard and interior, whilst the A7 has its own unique exterior panelwork.