Aftermarket specialists are showcasing some of their latest tuning projects in Geneva next week. In addition to Startech revealing its new widebody Range Rover Velar, Brabus has revealed what it has in store for the Swiss motor show-and it won't disappoint. Based on the Mercedes-AMG E63 S, Brabus has essentially transformed the luxury sedan into a four-door supercar thanks to extensive modifications made to AMG's 4.0-liter twin-turbo V8.

Dubbed the Brabus 800, the engine has been tuned to deliver an extra 186 ponies, bringing the total output up to an impressive 789 horsepower at 6,700 rpm. This was achieved by tweaking the engine's two turbochargers, which has also increased torque by 74 lb-ft, up to a whopping 737 lb-ft at 3,600 rpm. With this extra power on tap, the E63 S can now sprint from 0-62 mph in just 3.0 seconds, making it 0.4 seconds quicker than the standard car. Brabus has also given the wagon version the same treatment. Unsurprisingly, its heavier body has affected the performance, but it's only by a tenth of a second slower to 62 mph.

Both cars have an electronically limited top speed of 186 mph, the same as the untinkered models, but Brabus says it's working to unlock that. As an option, the Brabus 800 can also be fitted with bare carbon fiber body parts, available with either a matte or high-gloss coating, which have been optimized in a wind-tunnel to improve the car's aerodynamic efficiency. Other options include alloy wheels measuring as large as 21 inches, a stainless steel exhaust system with ceramic-coated tailpipes, and a comprehensive selection of interior customization options. Brabus will be showing off the modified E63 S with a black and red interior pictured here at the Geneva Motor Show next week.