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Mercedes-AMG C 63
Featuring chassis and power-train technology from the just-launched C 63 coupe, the drop-top editions also get considerable body and suspension alterations. Both employ versions of the M177 4.0-liter V-8, the compact “hot-V” design with two turbochargers mounted between the cylinder banks. Rated at 469 horsepower and 479 lb-ft of torque in the C 63 cabriolet, or 503 horsepower and 516 lb-ft of torque in the C 63 S cabriolet, this engine works through a seven-speed "Speedshift" automatic that delivers ultra-quick gear changes and rev-matched downshifts. All power is sent to the rear wheels. Mercedes-AMG says that 60 mph comes up in 4.0 or 4.1 seconds. While the C 63 cabriolet is governed at 155 mph, the C 63 S allows a more generous 174 mph.
Source: Caranddriver.com