It's the Mercedes you see here, customized by Brabus, and it just made the journey from Germany to France to debut at the 24 Hours of Le Mans.
The open-top rocket sled is dubbed the Brabus 850 6.0 Biturbo Cabrio, but as you might have guessed, it's based on the Mercedes-AMG S63 Cabriolet. The donor vehicle already packs 577 horsepower from its 5.5-liter twin-turbo V8, propelling it to 100 km/h in 4.1 seconds en route to an electronically limited top speed of 250 km/h miles per hour. But in signature style, Brabus has completely overhauled the engine.
The venerable Benz tuner bored out the block from 5.5 liters to 6.0, fitted a new, crankshaft, forged pistons, connecting rods, cylinder heads, intake module, exhaust system, and turbochargers to increase output to a frankly mad 838 hp. With all that muscle channeled to the tarmac through all four wheels and a seven-speed automatic transmission, the 850 Cabrio will reach 100 km per hour from a standstill in 3.5 seconds and top out at 350 km/h. Brabus says it could go faster, but there's only so much the tires can handle.
Those figures leave the competition in a cloud of dust, which is a rather unpleasant place to be when driving with the roof down. The Bentley Continental GTC, Rolls-Royce Dawn, and Aston Martin Vanquish Volante all take longer to reach highway pace, stop short of the Brabus' top speed, and pack less power – as does, incidentally, the twelve-cylinder Mercedes-AMG S65 cabrio. While the Hennessey Venom GT Spyder and Bugatti Veyron Grand Sport Vitesse can go faster, those open-top cars don't have cabriolet-style folding roofs.
Of course, Brabus didn't stop at the engine. It also offers a complete carbon-fiber aero kit, 21-inch monoblock alloys (but offers everything from 18-inchers to 22s), and a fully refitted interior. And it will set yours up any way you want, though you can expect to pay a substantial premium for the privilege, on top of the $180k you'll have to shell out for the donor car.