New Mercedes-Benz SL65 AMG Sports Bi-Turbocharged V12 with 621-Horses

You would be inclined to believe that Mercedes-Benz had the top end of the market covered with its new 2013 SL63 AMG that's motivated by a twin-turbocharged 5.5-liter V8 producing 530hp (537PS) in standard form and 556hp (564PS) with the optional AMG Performance Package. Well, that's not the case as there's always a number of buyers who don't mind paying something extra to get more of