Photography By CAR AND DRIVER STAFF AND THE MANUFACTURER - Car and Driver (blog)

No sooner had we first seen Audi’s all-new A6 than we and many “Audisti” worldwide began speculating about the S6 variant. We had a pretty good idea of what it would look like—Audi’s S models tend to be pretty conservative—and what it would have underhood. ) Finally, as it unveils the 2013 S6 at the 2011 Frankfurt auto show , Audi has provided all the details, if not fulfilled our wagon dream. Both S6 models (as well as the S7 ) are powered by Audi’s new twin-turbocharged, direct-injected 4. 0-liter V-8, which produces 420 hp and 406 lb-ft of torque, the latter from just 1400 rpm. That’s a little less horsepower and a little more torque than the 435 hp and 398 lb-ft produced by the detuned Lamborghini-sourced 5. 2-liter V-10 in the previous S6. It is also a full 100 hp and 173 lb-ft down on the output of the same engine in... At a relatively dainty 4177 pounds (4299 for the Avant), the 2013 S6 is roughly 300 pounds lighter than the outgoing car, and the new A6’s architecture achieves a more-optimal front/rear weight distribution to boot. We could never break the five-second mark to 60 mph in the outgoing S6—the best we managed was 5. 4 seconds—but Audi says that the new one should be able to do the trick in 4. 8 seconds. Source: www.caranddriver.com