The 2012 Mosler RaptorGTR is one serious supercar. It boasts 838 horsepower and weighs just 2,580 pounds. How does an exotic racer manage to weigh so little when it's packing a twin-turbo, 7.0-liter engine? Extensive use of carbon fiber is the key, and the payoff is a 0-60 time of only 2.6 seconds. If that's not quick enough for you, for another $70,000, the RaptorGTR can be upgraded to produce a neck-snapping 1,212 horsepower.