The world of high-end super-sedans, there's always room for more power. The quest to outdo the rest of the crowd is why BMW felt the need to boost its M5 with the 30 Jahre Edition, or why Mercedes' AMG cars are all available in more powerful "S" designations. It's also why Audi has felt the need to make its RS6 and RS7 faster, by introducing a more powerful "Performance" line.

In the transition from regular RS car to full-fledged members of the Performance line, the RS6 and RS7's twin-turbo V8 has gained an extra 33 kW (55 hp) and 50 Nm of extra torque on overboost, enough to send it from 0-100 km/h (62 mph) in just 3.7 seconds. 

Not only is that 0.2 seconds faster than the regular RS models they're based on, it's faster than the new turbo-charged Porsche 911 Carrera can manage, and the latter won't seat five people or hold their luggage.

Audi's quick cars set themselves apart from the other Germans with their quattro all-wheel drive system, and the RS6 and RS7 performance are no different. The system defaults to a 60/40 rear/front power split, but if owners tick the box for the rear differential it can also shuffle power between the rear wheels to make sure the wheel with the most grip gets the most power.