This is what a V12 Biturbo C-Class looks like, and we'll see it in the flesh at tomorrow's Frankfurt motor show. The latest offering to come from the power-crazed Brabus tuning firm, the Bullit is a Mercedes C-Class fitted with the same engine that powered the Brabus Rocket to a title of world's fastest saloon.The strains put on almost every element of the car by the 720bhp 6.3-litre V12 under the bonnet means the Bullit has received bespoke modifications in most areas.A more aerodynamic bodykit allows a 224 mph top speed, the height-adjustable suspension is custom built to cope with the weight and power of the V12 without ruining ride comfort, and a 5-speed automatic transmission has been designed to deal with the 811lb ft of torque produced by the V12. A rear locking-differential is also a unique feature, allowing the driver to choose from two different final drive ratios. The Bullit will hit 62mph in 3.9 seconds and 124mph in under 10.4 seconds. Thankfully, the brakes have also been uprated from the standard C-Class.If you fancy one of the fastest four-door cars ever to be run on the road, the Bullit will set you back a cool £236,300 – a bargain for a car that will outrun most modern supercars and accommodate two baby seats. Brabus claim the Bullit maintains road manners worthy of the three-pointed star, but we won't know for a while as the press car is yet to gain traction.