The 2015 Audi S6 is the performance variant of the A6. The all-wheel-drive sedan is powered by a twin-turbocharged 4.0-liter V-8 rated at 420 hp and 406 lb-ft of torque, and paired to a seven ...

If you're the type of driver who wants everyone to know you got the performance model, the S6 isn't for you. Unlike some aggressive-looking, excessively badged sporty cars, Audi's sporty midsize ...