Back in April, we saw the first shots of the 2013 Audi RS4 Avant beginning testing. We have just received a spy video of the Audi RS4 Avant performing some advanced testing on the Nurburgring
. In the video you can see the wagon tearing up the track and dealing with a bit of weather conditions. Previous reports have indicated that the boisterous wagon features a supercharged V6 rather than a V8. Total output should be measured at over 400hp.