Achieving a car’s quoted acceleration time and top speed is a tall order. Car maker’s test their cars under controlled environment that cannot be matched in the real world. But what if we tell you the new Porsche 991 Turbo S took on this challenge and went beyond its official top speed… way beyond?

You see Porsche says the top speed of the 2014 991 Turbo S is 318 km/h. On the evidence of this video – made by Christian Gebhardt of Sportauto Magazine – however, it so clearly isn’t. It is more than 330 km/h:

German car makers, of course, are always modest about the capabilities of their high performance models. Maybe it’s their cunning way of implying that they have superior technology, while in reality it’s just more blue-collar horsepower. At any rate, the Porsche 991 Turbo S has an exceptional performance for what’s basically a well-built, well-equipped, four-wheel-drive, grand tourer.

The car is powered by a twin-turbocharged version of the 991’s 3.8-liter flat-six engine, developing 560 horsepower. Hooked up to a seven-speed PDK, it enables the 911 Turbo to accelerate from zero to 100 km/h in 3.1 seconds.