Set to be unveiled next week in Geneva, Brabus has introduced the Mercedes S63-based 850 6.0 Biturbo Coupe the German tuner is describing as "the world's fastest and most powerful all-wheel-drive coupe." Bored out from 5.5 to 5.9 liters, the twin-turbo V8 has received a long list of modifications including bigger turbochargers, a custom crankshaft with longer stroke, a new intake module with larger air filter, carbon-fiber air ducts and gold heat-reflection sheathing on the intake and charge pipes.

Coupled with a remapped ECU and stainless-steel sports exhaust with 75-mm thick downpipes and special metal catalysts, output has increased to 838 hp and 848 lb-ft of electronically controlled torque. That's sent to all four wheels via a seven-speed automatic and the two-door coupe can now shift to 62 mph in 3.5 seconds, reach 124 mph in 9.4 seconds and hit a top speed of 217 mph. A carbon-fiber aerodynamic body kit includes a new front bumper with large intakes and spoiler, a custom rear diffuser and trunk-lid spoiler, while the side air outlets receive carbon-fiber surrounds. Platinum Edition 21-inch cross-spoke alloys finished in Shadow Gold Chrome will be on display at Geneva.

However, the German tuner offers a range of 18 to 22-inch rims, and a suspension lowering module that drops the hi-po coupe by 15 mm ensures the alloys fill out the wheel wells nicely. The stunning interior comes swathed in black Mastik leather contrasted with copper-colored seams and piping, a deep black Alcantara headliner and Shadow Gold finished accents and switches to match the monoblock alloys. Wood trim is replaced by carbon fiber, aluminum features on the pedals and paddle shifters, ambient lightning can be set to different colors and a 250-mph speedometer shows this car mean business.