A new front bumper and huge 20-inch alloy wheels add visual muscle, while the cabin has also been revised with black and red Brabus-badged leather. Mechanically, the only modification is a hi-tech self-locking differential, to give the car an even more fiery character and greater traction. Brabus also offers a Racing kit, with extensive engine upgrades and a new exhaust system to boost power from 626bhp to 651bhp. It makes the SLR illegal for road use, but cuts the 0-60mph time by six per cent to 3.6 seconds.