Some tuner cars scream from the hilltops just how fast, ragged and rampant they could become with a simple flex of the right foot. Even if it isn’t true. You’ve seen them outside McDonald’s on a Saturday night, all wing, bluster and grenade launcher exhaustwith the power of an asthmatic ride-on lawnmower.

The G-Power M5 Hurricane RR is not one of those cars. It doesn’t need to shout about anything. Apart from the carbon wrap, the minor body kit and the 20-inch wheels it looks like any other M5, special in its own way but hardly in the giant-killing leagues.

But the truth is that this is the fastest four-door sedan in the world, good for 231 mph. That was enough to secure the production car speed record for the McLaren F1 for more than a decade until the Bugatti Veyron came along, so it’s fair to say this car can still blow most supercars off the road at the top end.

It might look like a mild-mannered Clark Kent, but Superman is on call with a twitch of the right big toe. Because this car comes with two superchargers, 800 hp and 590 lb-ft of torque, and those limits are defined by the strength of the SMG transmission rather than the work under the hood.

That work, incidentally, is a thing of wonder. The luminous aluminum orange airbox sits proudly in the center with the superchargers braced to it on each side. Visually speaking, it’s the loudest part of the car, but unless you’re showing it off to a fellow petrolhead nobody will ever know.

G-Power’s mechanical side was born from a marriage with ASA, which supplies forced induction to the likes of Alpina. Its twin T1-316 superchargers combine with an uprated cooling system, forged Mahle pistons and new H-beam connecting rods and piston pins. All the crankshaft needs is a thorough inspection to ensure it’s one of BMW’s best.

The other internals are more than capable and G-Power confidently slaps a two-year warranty on this extreme road warrior. In fact, they could theoretically squeeze 900 hp out of the system that comes with superchargers spooling up to 100,000 rpm and the massive amounts of gas coursing through the bright-orange airbox, but 800 hp is, unbelievably, erring on the side of caution.

For our test, Michelin had the idea to gather at the Nrburgring to show the true potential of its Pilot Sport 2 tire before introducing the much-improved PS3. The French company paid the insurance, issued the invite and sent us out onto the world’s most challenging racetrack in a $300,000, four-door rocket. Brave would be one way to put it. Borderline insane would be another.

An instructor up ahead means I can’t fully tap the performance. Instead we drop back, plant the throttle and then dive on the brakes again. And thankfully those aren’t stock, they’re Brembo 15-inch rotors all around with six-piston calipers on the front and four-piston calipers on the rear. That’s the setup normally found on a Porsche Cayenne Turbo, and good enough to stand the car on its nose and test the traction of the Pilot Sport 2s at both ends of the scale.

It’s fair to say this car is hard on tires, as the estimated 0-60 mph time of 4.35 seconds has nothing, absolutely nothing, to do with the power. It’s all about getting it down and this car just can’t. It chirrups the tires all the way into Fourth gear and it’s only as the car gains momentum and speed that the crushing firepower under the hood makes itself felt.

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