The Brabus Rocket, built in small-series production based on the Mercedes CLS series, is the world's fastest sedan. During test runs on the high-speed track in the southern Italian town of Nardo the $435,000 high-performance automobile improved upon the previous record of 217.5 mph, held also by Brabus with the E V12 Biturbo. The new record is 225.1 mph (362.4 km/h).

The heart of the new record car is the twin-turbo V12 engine from the latest Mercedes 600 models. It was fitted into the tight confines of the four-door with almost surgical precision. Brabus increases displacement to 6,233 ccm with a special crankshaft, larger cylinder bore and forged pistons. In addition the engine is extensively modified internally: Airflow in both intake and outlet manifolds of both cylinder heads is optimized and sport camshafts are installed.

After the engine conversion, also available for all current Mercedes-Benz 600 and 65 models with twin-turbo V12 engine, the Brabus S V12 S Biturbo engine becomes the most powerful TÜV-tested engine from Germany. The engines puts out its maximum power of 730 bhp at 5,100 rpm. Peak torque is 973 lb-ft, limited electronically to 812 lb-ft, available from a low 2,100 rpm.

In addition to the top speed of 225.1 mph, limited electronically for street-legal operation to 220 mph, the Brabus Rocket also offers acceleration at the highest level: 0 – 62 mph in 4.0 seconds, 0 – 124 mph in 10.5 seconds, 0 – 186 mph in 29.5 seconds.