Audi's New RS 6 Avant and RS 7 Sportback Put Performance at the Fore

Audi's RS 6 and RS 7 vehicles are already among the automaker's most powerful, but the brand continues to push its limits. Sharpening the models' appearances and driving experiences, Audi has introduced the new RS 6 Avant and RS 7 Sportback performance vehicles, set to launch on December 8.Both models are equipped with an improved 4.0-liter V8 engine that includes larger turbochargers and increased boost pressure, improving the cars' output to an impressive 621 horsepower and 627 pound-feet of t...