When it gets into its stride, though, it’s an awe-inspiring thing, hitting 125 mph in 9.5 seconds and 185 mph in 25.8 seconds. It won’t worry a Veyron, but it would leave a very perplexed LP670-4 driver eating its dust. It doesn’t hit any kind of aero wall on the Ring either, and keeps pulling down the main straight until we run out of road. Incidentally, with the new record as the world’s fastest sedan G-Power only beat itself, the company’s 750-hp M5 variant held the crown till this one came along on specially developed rubber that could take the weight and top end speed.

And though the torque curve remains intact, it’s been bumped up so high that there’s no need to really work the revs any more. You can, and the true ballistic power still comes at that 8000-rpm watershed, but there’s acceleration to spare in higher gears too. G-Power’s Zoran Zorneke proves the point by taking the whole Ring in Third and Fourth gear for one lap; the car is never found wanting.

As for the corners; well, the fully adjustable suspension helps the already impressive M5 scythe into bends and then it’s all down to the driver. Of course you can leave all the BMW driving aids on and in daily life that would be a life-saving decision, but there’s no point owning a car like this to leave everything to the nanny state.

Switch them off and you better know what you’re doing as that much force through the rear can spike the car sideways in a heartbeat. I’m not ashamed to say I partially bitch out and partially listen to G-Power’s concerned words; the Nrburgring is just too tight, too unforgiving and too serious to take that kind of liberty.

And even with the gadgets switched on, the car pulls at the leash in the bends enough to suggest that even the computers won’t save you from crass stupidity. You could use this car every day, you really could, but you’d be tickling the throttle in the real world and barely touching that tidal wave of performance underfoot.

Which begs the question, why? Well, there’s no doubt it’s a niche product and it won’t be the first $300,000 car in the garage. But for the super rich there’s a perverse appeal in taking what looks like a standard sedan down to the traffic light Grand Prix and blowing the doors off a Lamborghini or Ferrari.

They will have Superman, without the ridiculous pants over tights costume, and they will have the fastest four-door on Earth. But with the infinitely tunable twin-turbo M5 on the way, don’t bet against G-Power smashing its own record again before too long.

G-Power M5 Hurricane RR

Longitudinal front engine, rear-wheel drive

5.0-liter V10, dohc 40-valve, Mahle pistons, G-Power connecting rods and piston pins, twin ASA T1-316 superchargers, G-Power air intake, 100-cell catalytic converters, 105mm exhaust pipes.

Seven-speed SMG auto manual

Nine-way adjustable KW coilovers

Six-piston Brembo calipers, 15-inch rotors (f), four-piston calipers (r)

Wheels and Tires
Silverstone Clubsport alloys,
9.5x20 (f), 11x20 (r)
Michelin Pilot Sport PS2, 245/35 (f), 285/30 (r)

Peak Power: 800 hp @ 7500 rpm
Peak Torque: 590 lb-ft @ 5000 rpm
0-60 mph: 4.35 sec. (G-Power est.)
Top Speed: 231 mph

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