10. 2011-2013 Mercedes-Benz S63/ CL63/ SL63 AMG
5.5-liter twin-turbo V-8; 563 hp @ 5500 rpm, 664 lb-ft @ 2000-4500
Pay no heed to the 63 suffix in any of these cars’ names. For the 2011 model year, Mercedes-AMG replaced the familiar “6.3-liter V-8” (which was truly a 6.2-liter V-8) with a smaller, 5.5-liter twin-turbocharged, direct-injection V-8. In the S63, CL63, and SL63, the engine can crank out as much as 563 hp and 664 lb-ft of torque, but only with the optional AMG performance package. If you skip that option pack, output falls to 536 hp and 590 lb-ft.