The power-hungry folks over at Brabus took a closer look at the Mercedes-AMG S65 Cabriolet and decided that the one thing it needs for sure is more ponies under the hood. 

So they set out to increase the displacement of the 6.0-liter twin-turbo V12 engine to 6.3 liters, enlarged the cylinder bores, fitted larger turbochargers, a new control system, and a bespoke exhaust manifold, which results in a total output of 900PS (887hp) and 1,500Nm (1,106lb-ft) of torque.

As it stands now, the convertible version of the S-Class needs just 3.9 seconds from naught to 100km/h (62mph), and can keep going up to a top speed in excess of 350km/h (217mph). By comparison, the stock model, which is 270PS (266hp) and 500Nm (369lb-ft) of torque less powerful takes 4.1sec for the 0-100km/h (62mph) acceleration, and its top speed is electronically limited to 250km/h (155mph).

In order to send that much power to the rear wheels, Brabus had to modify the 7-speed automatic transmission. Moreover, the car, which is now said to be the world’s fastest and most powerful street-legal four-seater convertible, also benefits from a high-performance limited-slip differential, with a locking rate of 40 percent.

Other changes made to the Mercedes-AMG S65, which is now known as the Brabus Rocket 900 Cabriolet, are the sport exhaust system with ceramic tailpipes, 21-inch wheels, wrapped in low-profile tires, or 22-inch available as an option, lowering module that brings the vehicle 15mm (0.6in) closer to the ground, and an aerodynamic body kit.

The interior has received a few mods too, such as the aluminum accents, scuff plates that carry the brand’s illuminated logo, in different colors, and a new digital speedometer that reflects the car’s potential by going all the way up to 400km/h (250mph).

Brabus will display their Rocket 900 Cabrio at the 2017 Frankfurt Motor Show, from September 12, alongside the facelifted versions of the S-Class Coupe and Cabriolet.

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