Mercedes-AMG GLC 63 due in 2017

Spy photographers have once again spotted a 2017 Mercedes-AMG GLC 63 development mule testing in Germany.

The car is wearing a new front bumper that is larger than those fitted to earlier mules, and it has wider air intakes, giving the super-SUV more muscular front-end look.

Insiders suspect that the car will also get a long hood that adjust the GLC, to provide more space for the wet-sump, twin-turbocharged 4.0-liter V8 engine that powers it.

Shared with models like the C 63 saloon, the engine is capable of producing up to 503bhp and 516lb ft, as in other models.

Elsewhere, the bodywork looks identical to that of the GLC 43, which is already on sale. It is thought that the interior will be identical to that of the GLC 43, which uses a twin-turbo V6 engine to produce 361bhp and can accelerate from 0-62mph in 4.9 sec.

AMG boss Tobias Moers recently said the AMG 63 models should maintain the rear-wheel drive layout, leading some to suggest the hottest GLC could be back-driven. However, the largest GLE 63 comes exclusively with 4Matic four-wheel drive, so it seems more likely that this layout will be offered on the GLC.

AMG has set the GLE 63 to send the 69% drive to the rear wheels, a similar level of traction in the rear, and bias may be expected with the 4Matic-equipped GLC 63.

No arrival date has been set, but the Geneva motor show, is a likely venue for the model’s debut.