The Audi S6 with the new 4.0 TFSI Brand Audi The Audi S6 and S6 Avant use the 309 kW (420 hp) version of the new 4.0 TFSI. The twin-turbo V8 provides a constant 550 Nm (405.66 lb-ft) of torque from 1,400 to 5,300 rpm. It accelerates the S6 from 0 to 100 km/h (62.14 mph) in 4.8... By Car Division, 27 February, 2012