Just this week, we were treated to our first look at the next-generation Mercedes-AMG S-Class. In its S63e guise, the performance luxury sedan is expected to utilize a hybrid setup generating around 700 hp. Slotting above the S63e will be the S73e, which is expected to boast an increased output of 800 hp. German tuner Brabus, on the other hand, has created a new Mercedes-AMG monster that's even more powerful than the upcoming S73e: meet the new Brabus Rocket 900. Based on the four-door Mercedes-AMG GT 63 S, the Rocket 900 is limited to just ten examples.
Under the hood, Brabus has increased the displacement of AMG's twin-turbo V8 from 4.0 liters to 4.5-liters and installed two custom turbochargers that increase the boost pressure to 1.4 bar.
To help the more potent engine breathe, Brabus also fitted new air intakes on either side of the grille. As a result of these tweaks, the power output has increased from 630 hp and 664 lb-ft of torque to 888 hp and 992 lb-ft of peak torque.
However, the torque level has been electronically-limited to 774 lb-ft to protect the powertrain. But with 258 more ponies and 110 more lb-ft, this is still a significant upgrade over the stock GT63 S. This extra muscle enables the modified GT63 S to accelerate from 0-62 mph in just 2.8 seconds down from 3.1 seconds, and top out at an electronically-limited 205 mph. Technically, this 200-mph missile is capable of even higher speeds but Brabus limited it to 205 mph to protect the tires.
To transfer all this power to the tarmac, Brabus has equipped the limited-edition GT63 S with extra-wide tires wrapped around hi-tech forged wheels measuring 21 inches at the front and 22 inches at the back with aero discs made from naked carbon. To make room for these wider tires, the Rocket 900 sports a cutom carbon widebody kit with flared fenders that makes the car 3.1-inches wider. Larger front air intakes also improve the cooling, while an integrated front spoiler reduces the front-axle lift.
Elsewhere, a carbon rear wing and rear diffuser increase the downforce and improve stability. An air suspension system with selectable comfort and sport modes lower the ride height by around one inch.
The first example is finished in a special Stealth Gray with matching chrome parts. This finish is also applied to the interior, which features black leather and Alcantara materials and carbon accents. Given its exclusivity and performance, the Brabus Rocket 900 isn't cheap. A standard GT63 S will set you back at least $161,200, but this Stealth Gray example costs 427,000 euros ($505,794).