The 2015 Audi R8 is the halo product from the brand–a mid-engine supercar unlike anything else in the brand's otherwise family-centric lineup. For 2015, it's offered with a few new exterior colors, a quilted headliner, and new optional sport exhaust for V-10 models. The entry R8 is still a 420-horsepower, 4.2-liter V-8-powered...
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