Brabus unveils a convertible fast enough to race the sun

Set to be unveiled at the Frankfurt Motor Show, the new Rocket 900 supercar took Mercedes' standard 6.0-liter twin-turbocharged V-12 engine and made it a 6.3-liter, increased the size of the turbochargers and added a custom exhaust system. It'll go 0 to 60 in 3.9 seconds and boasts a top speed of 217 miles per hour.

The Rocket 900 eclipses the Brabus 850 6.0 Biturbo Cabrio as the fastest cabriolet.

Brabus also says it added carbon aerodynamic-enhancement exterior components, 21-inch forged wheels and a custom leather interior. Motor Trend reports the company has also upgraded the seven-speed automatic transmission, added a limited-slip differential and installed a lowering control module to drop the car more than a half-inch closer to ground level.

Pricing for the Rocket 900 will be made available during its public debut in Frankfurt from Sept. 14-24.