We just brought you some spy shots of a psychadelically camo'd RS6 being tested on the famed Nurburgring, but our number one source for Audi info, Fourtitude, scrounged up some additional shots of the upcoming RS6 that contradict the earlier ones. The main difference between the two mules are the fender flares. The Nurburgring mule features flares that mimic the fender extensions used on the original Audi quattros in the '80s. The pictures hosted by Fourtitude feature more traditional flaring that just extend the lip of wheel well, not the entire fender. Personally, we like the more modern flares.

Also of note is Fourtitude's speculation on what will be powering the RS6. We mentioned last time that it could be a twin turbo version of the S6's V10, itself derived from the Lamborghini Gallardo's engine. While talk of a twin turbo FSI V8 has also been heard, Fourtitude says the TT V10 is more likely, with power levels even higher than early guesstimates. Think 600-650 horsepower. Holy Snikees!

Also included in Fourtitude's report are spy shots of the Q7 V12 TDI, a production version of the concept diesel ute sporting a version of the Audi R10 Le Mans racer's oil-burning V12 shown at the Detroit Auto Show this year. The front fascia is a dead ringer for the Detroit concept, and those ceramic rotors look larger than a Hyundai Elantra's entire wheel.

[Source: Fourtitude]