German tuner Brabus has tendered this AMG S65 cabriolet for consideration at the upcoming Frankfurt show, and it should gets high marks for high power, and high drama, too. Followers of the company’s high-performance efforts should fear not: Brabus’ reputation as the foremost tuner of Mercedes-Benz cars is secure.

The company calls this example the Rocket 900, and unleashing the latent power of the S65’s 6.0L V12 engine was the order of the day. Cosmetics are important for a tuner project, of course, establishing the particular car as an exclusive and individual revision of the base model. But what happens when foot interacts with accelerator is paramount. So Brabus brought the engine’s displacement up to 6.3L.

Larger tuners and a reprogrammed computer also help improve the Rocket 900’s available horsepower rating: the gain registers at over forty percent, from 612 to 887. Torque is bumped up to 1,106 pound-feet, from the production car’s 738, although it’s limited to 885 pound-feet. Still and all, Brabus claims that their modified S65 is the fastest four-seat convertible car available anywhere, boasting a 0-60 time of 3.9 seconds, and a top speed of 217 MPH.

Mechanical fundamentals include a new exhaust manifold to improve the car’s airflow, and Brabus’ larger turbochargers and larger bore to increase fuel supply. The AMG 7-speed gearbox’s improved performance comes by way of more acute shift points, and the Rocket 900 receives a new limited-slip differential.

The tuning company also gave the S65 a carbon-fiber aerodynamics package, including intake surrounds and spoiler, which may be gloss finished if desired. Interior flourishes include color-customizable LED backlighting, black ash trim, and two-tone upholstery. Trim materials, and interior/exterior color schemes, are of course down to customer preference.

Brabus will formally introduce the Rocket 900 this month in Frankfurt. Pricing TBA.