In addition to a hybrid version, Audi is giving its sleek new A6 the full S treatment. Our spy photographers recently snapped this completely undisguised prototype out testing in Germany, leading us to believe that the production car will likely debut in the not-too-distant future. Audi's usual S up-do is fully evident here, with the more aggressive front fascia, side sill extension and four exhaust tips out back all signaling a more sporting sedan.
The new S6 will likely ditch the current car's 5.2-liter V10 mill in favor of a turbocharged 4.0-liter V8. Since the S6 will compete with the likes of the Mercedes-Benz E63 AMG and BMW M5, expect power output to be somewhere in the 500- to 550-horsepower range.
[Source: KGP Photography]