Audi S6/RS6, S7, S8 power numbers revealed

German publication Autobild has reportedly acquired some powertrain details about a few upcoming Audi models, including the S6, S7 and S8. Apparently we can expect a twin-turbocharged V8 packing up to 500 horsepower in the S8, while the S6 and S7 will get 440 and 470 horsepower, respectively.

Toward the end of 2012, Audi will unleash the RS6, which will carry a BMW M5-besting, 580-horsepower version of the same twin-turbo mill powering the S6. We still don't know how big the proposed engine is – earlier reports have suggested that a 4.0-liter V8 is in store – but it should get 20 percent better fuel economy than the outgoing naturally aspirated V10.