Not long ago, Audi announced the Audi RS 6 Avant and RS 7 Sportback performance – a new label that replaces the plus designation. Both have been tuned to give more horsepower and torque but without compromising fuel efficiency.

Engaging a new overboost function will let the driver draw an additional 50 Nm of torque. As for the century sprint, the RS performance variants achieve this in 3.7 seconds (0.2 seconds faster than before) and 0-200 km/h in 12.1 seconds (1.4 seconds faster than the previous RS). The engine is paired to an eight-speed Tiptronic gearbox with Sport and Manual modes.

Although both feature the same twin-turbo 4.0 litre TFSI V8 engine, the engine management system has been tuned to provide the turbochargers with more boost pressure. As a result, the power plant now produces a total of 605 hp (45 hp more than before) and 700 Nm of torque.

While top speed is limited to 250 km/h, a dynamic package can be opted for. This package, when installed, will lift the top speed to 280 km/h. Audi claims that fuel consumption figures are unchanged – the RS 6 Avant averages 9.6 litres per 100 km and the new RS 7 Sportback, 9.7 litres per 100 km.

Aesthetically, not much has been done to the RS 6 Avant aside from updated LED headlamps and rear lights, matte-black coated roof rails and a 21-inch aluminium wheels in a five-V-spoke star design with a matte titanium and gloss finish. The RS 7 Sportback however, comes in a new metallic colour called Ascari Blue and it receives 21-inch wheels in five-double arm design instead.

GALLERY: Audi RS 6 Avant performance

GALLERY: Audi RS 7 Sportback performance