The flagship AMG version of the new C-Class has been spied by our photographers.

While the current model has a 6.3-liter naturally-aspirated V8 engine, its replacement could get the twin-turbo 5.5-liter V8. This M157 engine is available in various other AMG models and has an exact displacement of 5461cc with a bore of 98mm and a stroke of 90.5mm. In the C63 AMG, this will probably be offered in the 525 hp (391 kW) version.

The images depict a prototype but we already can tell that it will get wider bumpers and wheel arches, along with the familiar AMG wheels and larger air intakes.

Gallery: 2014 Mercedes-Benz C63 AMG spy photos available

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