Audi RS6 Avant and RS7 Sportback performance Make Video Debut

The Audi RS6 has been duking it out with the Mercedes-AMG E63 since 2013. During this time, the slightly sexier RS7 also picked a fight with the top CLS model and the BMW M6 Gran Coupe. When a mid-life upgrade was launched a few months ago for both Audi models, it only changed the headlights and added some new paint options. Yet we’ve known that the Germans were cooking up something even more exciting at their Skunk Works laboratorie…