Our spy photographers have snapped the first pictures of the 2013 Mercedes S63 AMG undergoing testing near the Nürburgring.

Our spy photographers have snapped the first pictures of the 2013 Mercedes S63 AMG.

Caught undergoing testing near the Nürburgring, the heavily camouflaged prototype is distinguished by a larger air intake, a high performance braking system and AMG wheels.

Additional information is limited, but the car will likely be powered by a twin-turbo 5.5-liter V8 with 537 bhp (400 kW / 544 PS) and 800 Nm (590 lb-ft) of torque. With the AMG Performance Package, that gets tuned up to 563 bhp (420 kW / 571 PS) and 900 Nm (664 lb-ft). It should be connected to a seven-speed Speedshift MCT transmission, which will ensure this is one fast flagship.

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2013 Mercedes S63 AMG spied for the first time