Think the V8-powered Mercedes-AMG G63 has too few cylinders? Well, Brabus apparently agrees, having just dropped a 662 kW turbocharged V12 into the G-Class.

Billed as the “world's most powerful twelve-cylinder off-roader”, just ten examples of this very special Brabus G V12 900 will be built.

Each one features a highly tuned version of the German brand’s twin-turbo V12 petrol engine, bored out from 6,0 to 6,3 litres and producing a whopping 662 kW and 1 500 N.m (although Brabus says the latter figure is “limited electronically to 1 200 N.m”). For reference, the standard version of this powerplant makes 390 kW in the Mercedes-Benz S600 L.

Employing a (presumably uprated) nine-speed automatic transmission and all-wheel drive, the G V12 900 will hit 100 km/h from standstill in a claimed 3,8 seconds (seven-tenths quicker than the G63) and top out at 280 km/h.

So, what has Brabus done to the standard engine? Well, the company has installed a special billet crankshaft with longer stroke, larger forged pistons and special “precision-balanced” billet connecting rods, as well as reprogrammed the engine electronics.

The two production turbos, meanwhile, have been uprated and the exhaust manifolds suitably modified. The conversion includes 80 mm downpipes, free-flow metal catalysts and a Brabus stainless high-performance exhaust system with actively controlled flaps. A new intake manifold includes a special air filter box with a larger cross-section and uprated filters, as well as "gold heat reflection" sheathing.

The rest of the vehicle has been upgraded, too, now boasting a wider track, a widebody kit (adding 100 mm to the width of the body) and forged wheels measuring up to 24 inches in diameter.

Inside, you’ll find swathes of leather, Alcantara headliner, a "One of ten” plaque and three analogue additional gauges (delivering speed, outside temperature and time information) for the rear passengers. Further features in the cockpit are the aluminium pedals and door-lock pins as well as the naked-carbon scuff plates with backlit logos.