► Spyshots reveal GLC 63 AMG
► Borrows C63's 4.0 bi-turbo V8
► Big brother to the GLC 43
The Germans' blunderbuss strategy of mating every powertrain to every bodystyle clearly points to a raft of warp-speed crossovers in the pipeline.
A few days after spotting the 422bhp M derivative of the 2017 BMW X3, our spies have now unearthed the Mercedes-AMG GLC 63 hotrod undergoing a shakedown test on the roads around the Nurburgring in Germany.
Sitting above the already-announced GLC 43 by AMG, this promises to be one of the quickest mid-size crossovers around.
Merc's AMG-powered GLC: the lowdown
This breathed-upon SUV isn't exactly a great secret; the GLC range is, after all, powered by the C-class mechanical architecture, making a banzai high-performance version a likely addition once the conventional crossover range was fully launched.
It will be powered by the same mighty 4.0-litre twin-turbo V8 you'll find under the bonnet of the C63 saloon and coupe and our sources suggest the full 469bhp will be available in the GLC by AMG.
It is not yet clear whether Affalterbach has sanctioned an unhinged S version, mirroring the C's full 503bhp.
It's all in the detail...
Although many of the aero details and gaping air intakes of this prototype are still lightly disguised, it's clear to see the quad exhaust pipes and huge drilled brake discs grabbed by pretty chunky AMG callipers.
Click here to read all about the regular Mercedes-Benz GLC range.