You could hardly accuse the standard Jeep Grand Cherokee SRT8 of lacking ponies. With 347kW and 630Nm on tap, it already explores the limits of how much power a top-heavy SUV designed for off-roading should realistically have. Right?

Hennessey, of course, disagrees completely.

The American supercar manufacturer and tuner has just sent out a preview of its latest project - and it involves almost doubling the outputs of the Grand Cherokee SRT8.

With the displacement of the Jeep's 6.4-litre Hemi V8 increased to 7-litres and two turbos thrown in for good measure, the Hennessey SUV puts out 600kW and 1115Nm - enough, says Hennessey, to blast it from standstill to 96km/h in just 3.1 seconds.

The rest of the mechanics have been upgraded in accordance, the Jeep sporting lowered and stiffened suspension, 15.1-inch Brembo anchors at each end and an upgraded gearbox.

Company owner John Hennessey describes it as the ultimate snow machine: “This vehicle is designed for the performance minded driver who lives in Aspen or Moscow and wants to be the fastest in all weather conditions.”