The new generation 2014 Audi RS6 Avant goes against the Vauxhall VXR8 Supercharged in a battle on the race track. If you're in the market for a powerful station wagon, the 2014 RS6 Avant and the Vauxhall VXR8 are two of the best choices available today. The 2014 Audi RS6 Avant comes with a 4.0 TFSI twin-turbo V8 engine that develops 560 hp and 700 Nm of torque. The Vauxhall VXR8 Supercharged hides a 6.2-liter V8 under its hood, which develops 576bhp and 545lb ft of torque.