The 2013 Tramontana XTR is powered by a new 5.5-liter twin-turbo V12 engine, producing 888 horsepower and 678 pound-feet of torque. This new supercar will be released by the end of 2012. There are only 12 units will be built a year. The 2013 Tramontana XTR retails for $514,000. [Autoblog]
