German tuner Brabus calls its latest creation the Rocket, and one look at its numbers tells why. After recording 225.18 mph on the high-speed Nardo, Italy, test track, the Mercedes CLS-based Rocket blasted into record books earlier this year as the world’s fastest street-legal sedan.

Power comes from a twin-turbo V12 bored to 6.2 liters and fit with forged pistons and hotter cams. Combined with intake and exhaust manifold tuning, large custom turbochargers and a reprogrammed electronic control unit, the mill yields 730 hp and 973 lb-ft of torque, though torque is electronically limited to only 811 lb-ft.

A modified five-speed automatic transmission and a locking differential shuttle that power to the rear wheels. Further modifications include a height-adjustable suspension, 19-inch wheels and ceramic front brake discs with 12-piston calipers.

The Rocket spent considerable time in a wind tunnel forming the exterior for optimal airflow. The result is this monster runs from 0 to 124 mph in just 10.5 seconds.

The cost for this cruise missile: $444,000.

Brabus has been building the world's fastest street-legal sedans for several years running. This 'tradition' started in 1996 with the 205-mph Brabus E V12 and reached the next level in 2003 in the guise of the 217-mph E V12 Biturbo. In 2006 the Brabus Rocket, built in small-series production and based on the Mercedes CLS series, improved the world record to 225 mph.

But the Brabus R&D team wouldn't be the top-notch engineers they are if they were satisfied with that achievement. That's why in mid-October of 2006 they once more made the trek to the world-famous high-speed circular track in Nardo, Southern Italy. Under the keen eyes of the German Technical Inspection Agency (TÜV Süd) the $435,000 ultra-performance automobile improved the world record for street-legal sedans to 227.4 mph (365.7 km/h).

The Brabus Rocket is powered by a twin-turbo Brabus SV12 S engine, fitted into the tight confines of the four-door's engine bay with almost surgical precision. It produces a maximum power output 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.

A special crankshaft, larger cylinder bore and larger forged pistons increase displacement from 5.5 to 6.3 liters. Airflow in both intake and outlet manifolds of both cylinder heads is optimized and sport camshafts are installed.

The engine peripherals also underwent numerous modifications: Larger turbochargers, a more efficient intercooling system and a stainless-steel high-performance exhaust system with four exhaust pipes and low back-pressure metal catalysts are all part of the Brabus Rocket engine concept. Newly programmed engine electronics orchestrate the perfect interaction of all new components and contribute not only to maximum power yield but also to meeting the latest EURO IV emission limits.

Power is transferred to the rear wheels via a modified five-speed automatic transmission and the Brabus locking differential.

To keep the enormous performance potential of the world's fastest sedan safely in check at all times the vehicle's aerodynamics, suspension and brakes were modified extensively.

The Brabus ROCKET also meets the expectations of the most discriminating customers when it comes to the interior: The cockpit is upholstered with soft and breathable Brabus Mastik leather and Alcantara. Genuine-carbon-fiber applications are part of the sporty Brabus interior as are an ergonomically shaped Brabus sport steering wheel and the speedometer with 400-km/h (250 mph) dial.

The second Mercedes CLS generation has arrived and in a world debut BRABUS (Brabus-Allee, 46240 Bottrop, phone + 49 / (0) 2041 / 777-0, fax + 49 / (0) 2041 / 777 111, Internet www.brabus.com) presents an exclusive tuning program for the new four-door coupe at the Geneva Motor Show 2011.

Sporty-elegant design paired with aerodynamic efficiency is the trademark of BRABUS. For the new CLS body components were developed in the wind tunnel. They are manufactured in OEM quality from flexible high-quality Pur-R-Rim.

The BRABUS front spoiler is mounted to the production bumper and noticeably reduces lift on the front axle at high speeds. The front can be further upgraded with the BRABUS front apron caps. They feature strikingly styled air inlets and LED daytime running lights, available with either dark or chrome surrounds.

The CLS gets a distinctly dynamic appearance with the BRABUS sport fenders. In addition to gills each side also features a horizontal brace with illuminated BRABUS lettering.

The BRABUS sill skirts give the four-door an even lower, sleeker stance. A useful and appealing added feature is the set of integrated entrance lights that are activated via keyless fob or door handles.

LED lights for safely accessing the trunk in the dark are integrated into the BRABUS rear apron. Custom-tailored cutouts in the new rear apron provide the perfect backdrop for the four tailpipes of the BRABUS sport exhaust system. The rear appearance is rounded out with a centrally mounted reflector.

The BRABUS rear spoiler creates a perfect aerodynamic balance and emphasizes the sporty character of the BRABUS designer suit.

Another important contribution to the exclusive BRABUS look for the new CLS comes from the BRABUS Monoblock wheels in sizes ranging from 8.5Jx17 to 10.5Jx20. The OEM-quality alloys are available as one-piece and three piece wheels in six different designs.

The most exclusive version features BRABUS Monoblock VI, E or S wheels in size 9Jx20 in front and size 10.5Jx20 in back. The latest addition to the BRABUS wheel family is the BRABUS Monoblock F wheel. Presented initially as a forged wheel it is now also available as a 20-inch cast wheel, which also celebrates its world debut at the Geneva Motor Show 2011. On the new CLS this wheel can be mounted in sizes 8.5Jx20 and 9.5Jx20, painted a grey “Liquid Titanium” shade. The largest tires supplied by BRABUS technology partners Pirelli and YOKOHAMA for these wheels come in size 255/30 ZR 20 in front and in size 305/25 ZR 20 for the rear axle.

Specially calibrated to the use of sporty low-profile tires are the BRABUS suspension solutions, developed in cooperation with technology partner BILSTEIN. The lineup ranges from BRABUS sport springs for a ride-height lowering by some 30 millimeters (1.2 in.). Sportier ambitions can be met with the BRABUS complete suspension, which combines the ride-height lowering with firmer but yet comfortable damper settings. CLS models equipped ex-factory with the semi-active AIRMATIC air suspension system can be lowered by some 35 millimeters (1.4 in.) with the BRABUS suspension module.

BRABUS offers the world’s most extensive performance tuning program for Mercedes-Benz automobiles. The CLS 250 CDI BlueEFFICIENCY model equipped with BRABUS ECO PowerXtra D4 performance kit delivers an additional 31 hp (31 bhp) / 22.8 kW and produces a peak torque of 560 Nm (413 lb-ft).

For the CLS 350 CDI BlueEFFICIENCY BRABUS offers the ECO PowerXtra D6S tuning kit. The plug-and-play auxiliary control unit can be installed by any authorized Mercedes-Benz dealer or any BRABUS competence partner in less than 45 minutes. This high-tech performance tuning also gives the driver the opportunity to influence power yield via the selected shift program of the 7G-TRONIC PLUS automatic transmission.

In ‘Eco’ mode only peak torque is increased from 620 Nm to 690 Nm (457 to 509 lb-ft) between 1,600 and 2,400 rpm. The maximum power output remains unchanged. If the ‘Sport’ mode is selected manually or activated automatically both peak torque and power output are increased. Maximum rated power output then jumps from 265 hp (261 bhp) / 195 kW to 313 hp (309 bhp) / 230 kW at a low 3,600 rpm. Using this setting, the tuned turbodiesel model sprints from 0 – 100 km/h in just 5.9 seconds. Top speed is limited electronically to 250 km/h (155 mph).

All BRABUS engines are operated exclusively with ARAL high-performance lubricants.

Fully stainless-steel BRABUS quad sport exhaust systems are available for all CLS engine variants. The precision-calibrated exhaust systems optimize power yield and produce a throaty exhaust note.

Exclusive interior design that meets every customer request is a particular BRABUS specialty. The options for the new Mercedes CLS range from appealing accessories to custom-tailored interiors crafted from especially soft and breathable yet highly durable BRABUS Mastik leather and Alcantara.

The ergonomically shaped BRABUS sport steering wheel is available in a variety of leather/wood designs. It provides perfect road feedback and ensures a relaxed posture for long-distance driving.

Scuff plates with illuminated BRABUS logo or the speedometer with 340-km/h dial (213 mph) add individual highlights as do the distinctly sporty BRABUS interior accessories: They include aluminum components such as pedal pads, door-lock pins and shifter, and high-quality clear-coated carbon-fiber inlays for dashboard and center console. BRABUS also offers wood trim in any desired color and grain.

The four-door CLS coupe can also be equipped with a custom-tailored BRABUS multimedia package.