It was only a few months ago when Brabus worked its magic on the Mercedes-AMG S63 and now the reputable tuner is back with even more power because you can never have too much of it. The sedan is not riding solo to the 2018 Geneva Motor Show as itís being accompanied by its coupe counterpart, with both of them sharing a heavily upgraded version of the 4.0-liter V8 now featuring beefier turbochargers to up the power levels to unprecedented levels.

The two AMG rockets now have an immense 789 horsepower (588 kilowatts) and a maximum torque of 737 pound-feet (1,000 Newton-meters) delivered to both axles. Whether itís the sedan or the coupe, the sprint to 62 mph (100 kph) takes a mere 3.1 seconds and that puts the two S63 models in the same league with quite a few supercars. Top speed? Itís electronically governed at 186 mph (300 kph) for both body styles, but Brabus is already hard at work preparing some changes to unlock an even higher velocity.

The Geneva-bound Mercedes siblings come with a subtle aerodynamic kit encompassing several carbon fiber bits and pieces, along with custom alloy wheels up to 22 inches in size, a menacing all-black look, and a suspension lowering kit bringing the cars closer to the road by 15 millimeters (0.6 inches).

Itís a different story once you virtually hop into the cabins of the two high-powered S63 showcars as while the sedan continues the exteriorís dark theme, the coupe adopts a rather lovely Italian cuoio leather. Skyís the limit when it comes to customizing the interior as Brabus has the full arsenal of goodies, ranging from carbon fiber, aluminum, and wood accents to paddle shifters and numerous upholstery choices.

Starting off with the Mercedes-AMG E63 in the beefier S specification, Brabus has effectively turned it into a four-door luxurious supercar by heavily modifying the biturbo 4.0-liter V8.

The engine has been massaged to deliver an extra 186 horsepower (138 kilowatts) for a grand total of 789 hp (588 kW) at 6,700 rpm. It was possible by tweaking the pair of turbochargers, which in turn has also boosted torque by 74 pound-feet (100 Newton-meters) to a whopping 737 lb-ft (1,000 Nm) attainable from 3,600 rpm.

With the newly gained Brabus muscle, the E63 S can now jump to 62 kph (100 kph) in exactly three seconds, which makes it 0.4s quicker than the standard car. If you would rather have the more practical wagon, itís slightly heavier body makes it a tenth of a second slower in the sprint, at 3.1 seconds. Top speed? An electronic limiter is programmed to kick in at 186 mph (300 kph) as it is the case with the regular model, but not to worry as the tuner says itís looking for ways to unlock a higher velocity for both body styles.

The V8ís enhancements are only part of this tuning story considering the Mercedes-AMG E63 S can also be fitted with bare carbon fiber body parts optimized in the wind tunnel to maximize aerodynamic efficiency. You can get these pieces with either a matte coating or a high-gloss finish. Other goodies include a multitude of alloy wheels (up to 21 inches in size), a stainless steel exhaust system (with ceramic coating for the finishers), and a plethora of customization options inside the cabin.