MOST motorists do not need an SUV and nor do they need to get to 100km/h in 4.2 seconds, but that has not stopped BMW from offering a pair of vehicles can cover both bases in the form of its second-generation X5 M and X6 M SUVs.

The bonkers 423kW/750Nm M-powered versions are clearly an on-road proposition, but what is the point of a high-riding four-wheel drive that can worry most potent sportscars on a racing circuit?

We covered some of Australia's most exceptional roads over two days of Tasmanian touring and found BMW's brawn-brace makes far more sense than you might imagine.

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