2011 Audi R8 Spyder Preview

Audi currently sells two versions of its R8 supercar, the original 4.2-liter V-8 model and the recently revealed 5.2-liter V-10 version, but there are two more versions in the works--one of which has been revealed today ahead of its world debut at the 2009 Frankfurt auto show.The two new versions are the R8 Spyder