The Audi R8 features an exotic aluminum space frame, and a mid-mounted compact V8 engine making 420 horsepower. The most stunning feature is the clear Lexan cover over the engine, with LED lighting to show it off. The R8's skin was designed for efficient aerodynamics, by the same team of engineers who designed the R8 racing car; an underbody diffuser creates downforce to keep the R8 on the ground at its top speed of 187 miles per hour. It will accelerate from 0 to 60 mph in 4.4 seconds.