Maybe you've seen pictures of the 2010 Audi RS5 before. The prototypes were caught roaming around the California desert in varying degrees of camouflage last summer. But other than indicating that the program was indeed proceeding, the cobbled-together test mules didn't expose any details.
Now the RS5 is undergoing high-speed testing on the Nurburgring, and the prototypes look a little more finished. Our spy video also gives us our first chance to hear the high-performance coupe, and it delivers a good hint at what's under the hood
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