Sometimes we need a reminder of what subtlety is.
The trouble with the Audi RS6 Avant is that, although we tell ourselves it's a sleeper, the model has become less subtle with each generation, and now even non-gearheads will probably recognize that they're not looking at any normal station wagon. So what do you do when you want an actual Audi sleeper wagon? You squeeze 1,000 horsepower out of an A4 Avant. That makes for the sort of power wagon which nobody will see coming.
But you can see it here on the dyno, just don't expect to recognize it when it pulls up next to you at the lights.