Audi has a renowned racing background, and the mid-engine R8 truly embraces Audi's race car heritage. As with other manufacturer's flagship sports coupes, the R8 also represents this brand's premier opportunity to showcase its engineering abilities. The 100 horsepower-to-liter achievement is impressive, but with only 4.2 liters the R8 can't match the power of BMW's 500 horse, ten-cylinder M6. In terms of appearance and structure, however, the R8 shines. The exterior sheet metal, mid-engine placement with viewing window and a sophisticated space frame easily befit the six-figure price point. Renowned Quattro AWD is yet another ace in Audi's hand.