This is a prototype of the next-generation Mercedes-Benz C63 AMG sedan, caught here by Automedia photographers testing at the Nurburgring in Germany. Despite the camouflage, the telltale signs of a production flyer are there: wider bumpers and heelarches, bigger air intakes, plus AMG-specific alloys. The new C63 will, like the rest of the AMG family, ditch the current 6.3-litre naturally aspirated V8 engine for a new twin-turbo 5.5-litre V8, expected to deliver around 390kW.