Audi released official specs of the 2025kg RS6 in an Avant version on 4 September 2007. Due to be launched in April 2008, the car is powered by a twin-turbocharged 5.2-liter V10 with FSI, weighing 278 kg. The engine produces 426 kW (580 bhp) of power at 6,250 r/min and 650Nm (480lb ft) torque is available from 1,500 to 6,250 r/min. Reported performance figures: 4.6-second 0-100 km/h, 14.9 seconds 0-200 km/h and top speed is electronically governed to 250 km/h. The current setup employs 2 low presuure turbos on either side of the 'V'. Speculation is that Audi may produce an "RS6 Plus" in late 2008 upping the power to at least 475kW (636bhp) using remapped ECU's, larger intercooler's and increased turbo boost.
Its gonna be a bloody quick car!!!!