The Mercedes-Benz C63 AMG successor has been spied once again while conducting testing on the Nürburgring.

The Mercedes-Benz C63 AMG successor has been spied once again while conducting testing on the Nürburgring.

Chances are the range-topping C-Class will lose its "C63 AMG" moniker once the next-gen model arrives as the likelihood of maintaining the 6.3-liter engine is small. This will probably be replaced by a V8 5.5-liter twin-turbo (taken from the 2014 E63 AMG) outputting somewhere in the region of 525 bhp (391 kW).

The prototype seen here was wearing a lot of camo but we can tell it's the flagship version judging by the large AMG-specific alloys, quad exhaust setup, wider bumpers, beefy wheel arches and big air intakes.

The all-new C-Class will reportedly be unveiled in January next year at the North American International Auto Show (NAIAS) in Detroit whereas the flagship AMG version will probably be out a couple of months later, possibly at the Geneva Motor Show in March.

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