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Brabus’ S63 AMG-based 850 6.0 Biturbo Coupe is too powerful for its own good

Serial Mercedes-Benz tuner Brabus recently turned its attention to the S63 AMG Coupe, and the result is an exercise in excess.

Set to debut at the 2015 Geneva Motor Show, Brabus claims its 850 6.0 Biturbo Coupe is the “fastest and most powerful all-wheel drive coupe on the globe.” Take that, Bentley.

Brabus takes the stock 5.5-liter, twin-turbocharged V8 and punches it out to 5.9 liters. It also replaces the stock turbos with ones of its own design, and adds a new intake module and engine-control software.

The result is 838 horsepower and 1,069 pound-feet of torque, although Brabus says production cars will be limited to 848 pound-feet to preserve the drivetrain. It’s a powerful car indeed that has to be restrained from hurting itself.

Related: Brabus turns the Mercedes E63 AMG into an 850-hp monster

Not surprisingly, the performance claims are pretty spectacular. Brabus says the 850 6.0 Biturbo Coupe will do 0 to 62 mph in 3.5 seconds, and reach an (electronically limited) top speed of 217 mph, or about as fast as a LaFerrari.

How fast could it go if Brabus took the limiter off?

Exterior styling gets a similarly intense upgrade, with a new front bumper, rear diffuser and spoiler, and Brabus Monoblock wheels available in 18- to 22-inch sizes.

On the inside, Brabus redid the leather upholstery, and added a “shadow gold” finish that matches the wheels on the car in these photos.

Beyond that, the 850 6.0 Biturbo Coupe is still an S-Class, so it manages its impressive performance feats loaded down with all of the latest Mercedes tech.

It’s hard to imagine the luxury and performance offered by the standard S63 AMG Coupe ever being inadequate, but for those buyers with enough cash to indulge in even more of both, Brabus has clearly got that covered.