Those Dortmund-based master tuners at 9ff have set to work on a Porsche 911 GT2 and spawned a monster. An output of a 'mere' 530bhp has been boosted to a more than adequate 850, enabling the Porsche to accelerate from 0 to 62mph in three seconds flat – before the conversion, it had been a sluggish 3.7. Driving pleasure was previously limited by the top speed of 202mph but now you can simply specify your own ceiling: 215, 225 or 238. The magic threshold of 300kph (185mph) is reached in just 18.5 seconds. This power package with its BT2 prefix costs 285,000 euros.