It ain’t pretty, but it’s fast. Actually, with a claimed 211 mph top speed, the Brabus Bi-Turbo V12 GLK is the fastest SUV in the world. Which is kinda like being the winner in a Twinkie-eating competition: It’s an epic feat of embarrassing proportions.

To pull it off, the Brabus crew stuck with its tried and true formula of shoving entirely too much engine into a small package. Underneath the vented hood lies a Mercedes-sourced V12 that’s been stroked from 5.5- to 6.3-liters. From there, the Bottrop boys fit a duo of turbos, two intercoolers, a couple high-flow cats and a stainless steel exhaust. The effect is typical Brabus: A staggering 740 horsepower and 995 pound-feet of torque, which is actually limited to 811 lb-ft (at 2,100 rpm) to avoid the gearbox, diff and rear tires from vaporizing in an oily, metallic haze. And naturally, the absurdity doesn’t stop with the engine.

Twelve-piston front calipers clamp onto 15-inch discs, with six-piston calipers and 14.2-inch rotors in the rear, while a height adjustable coilover suspension with ten settings for bound and rebound join 22-inch wheels wrapped in a choice of Pirelli or Yokohama rubber. The exterior and interior have been restyled to match, and while Merc’s diminutive ‘ute isn’t exactly a beauty queen to begin with, Brabus’ blocky aftermarket brutalization lends itself well to the GLK’s squat proportions.

But aesthetics aside, there’s a bigger problem. Actually, there are 397,000 of ‘em. That’s how many euros you’ll need for the GLK V12. For that kind of scratch ($580,000 using a straight conversion), there’s a host of high-power exotica available.

Don’t have enough money for Brabus to swap out the V8 in your E63 AMG for a V12? Not to worry. Today at the Essen Motor Show, the German tuner officially launched its B63 S performance package for 6.2-liter V8 in the four-door Benz. The upgrade consists of dual “sport” air filters, high-flow catalytic converters, and revised program for the engine and results in a 30 horsepower increase.

Brabus is also offering other modifications for the E63 AMG as well, including a carbon fiber aero kit, wheels in 18 to 20-inch sizes, and various interior trim pieces like stainless-steel scuff plates, a new 225 mph speedometer, and wood or carbon fiber inlays. For the most part ,we’d skip the visual bits and stick with the engine upgrades. Hit the jump for full details in press release, or check out the high-res gallery below courtesy of Brabus.