The Corvettes, Porsches and Vipers that compete in the SPEED World Challenge GT series are about to get some serious competition from a serious car - the Mercedes McLaren SLR 722 GT. The car was homolgated to World Challenge specs by The Racers Group (TRG) and our sources at the series tell us it will first see competition at the Autobahn County Club outside Chicago on July 24-26th.

Designed specifically to run it a spec series in Europe, the 722 GT is powered by a modified version of the supercharged 5.5-liter V8 and makes 680hp and 612 ft-lbs of torque. It also only weighs 3,200 lbs, meaning it can accelerate to 60 mph in just 3.3 seconds. Thanks to some serious aerodynamics and a significantly lowered ride height, the 722 GT is also capable of hitting 2 Gs in the corners...