We're told to expect its appearance in Iron Man 2, but last week spy photographers caught up with the Audi R8 Spyder at the Nürburgring.

Normally, images would suffice, but nothing can replace the snarling shriek of the 5.2-liter V10 at full song.

There's no mistaking this particular prototype with the lesser 4.2-liter V8 model. We've heard rumor that Audi will exclusively offer the 525 HP, 390 lb-ft of torque, 5.2-liter V10 FSI in the Spyder, but we find it difficult to believe a V8 won't be offered at all. Equipped either way, the R8 Spyder will surely remove all stress and worry from your life with a quick kick to the go pedal. [via autowereld]