Spied: 2014 Audi RS6 Avant Caught on Film, Can You Tell from the Sound if it has a V8 or a V10 Turbo?

We have just snapped a prototype of the new 2014 Audi RS6 Avant testing in and around the Nürburgring track in Germany.

While you have no doubt seen the spy pictures of the RS6 Avant, the new video footage gives us the chance to see and more importantly, hear Audi's super-duper station wagon on the move.

It is widely believed, but not officially confirmed, that the new generation of the RS6 in both Avant and later on in sedan trims is powered by a boosted version of Audi's new twin-turbocharged 4.0-liter V8 engine that takes the place of the previous model's 571bhp 5.0-liter bi-turbo V10.

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Spy Shots: 2014 Audi RS6 Avant Shows up at the Nürburgring Wearing its Production Body

In January, we brought you a set of scoop photos showing a test mule of the next RS6 Avant based on the S6 Avant. Now, our eagle-eyed spy photographers have spotted the actual 2013 (or 2014MY) RS6 Avant prototype while lapping the famed Nürburgring track in Germany.

And why are we so confident that this is indeed an RS6 Avant test car, we hear some of you ask? Well, there are several telltale signs proving that this is an RS model, including the honeycomb-style front grille and brake air vents, the wider wheel arches and of course, the twin-tail pipes, all of which are signature traits of Audi's RS lineup.

If you take an even closer look at the pictures, you will also see the massive brake discs trying to hide behind the five-spoke alloy wheels.

Audi officials are keeping their cards close to their chest about the new RS6's drivetrain, but it is believed that the previous model's 571bhp 5.0-liter bi-turbo V10 could be replaced by an upgraded version of Audi's new 4.0-liter TSI that powers Audi's S6 and S7 (420HP) as well as the S8 (520HP) and the Bentley Continental models (500HP).

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