Image 1 of 6 from Ferrari upgrades FXX prototype

Ferrari's FXX prototype

November 14, 2007 After two years of ferocious testing, Ferrari have made large-scale improvements to one of the most extreme supercars they’ve ever built. Available only to a select handful of owners (including 7-times Formula One champ Michael Schumacher), the FXX prototype now makes a ridiculous 860 horsepower (641.3kW) at a screaming 9500RPM, and incorporates the absolute bleeding edge of barely-filtered F1 technology. Never intended for road use, the car can only be driven at trackdays approved by Ferrari, and all driving data is fed back into the Ferrari roadcar development program.