What do you do to improve a car that’s far more powerful than anyone will ever need it to be? Why, you make it more powerful, of course. Even if you hadn’t already seen the pictures and read the headline here, there’s a pretty strong chance that that Building the world’s fastest wagon was not enough for Audi Sport. Building the world’s fastest wagon was not enough for Audi Sport. At least that is Audi’s way of thinking as demonstrated by the new RS6 Avant Performance – and its RS7 Sportback sibling. German media reports that the Audi RS6 Avant is about to get an Allroad version, adding a modicum of off-road ability to Audi’s uber estate. In fact, the RS6 with the 4.0 litre turbo is actually a much better car than the V10-engined car ever was, with .