Remember the 9ff TR 1000 we featured two days ago as the fastest Porsche 911 in the world? Now some of you might have thought that 9ff is just claiming something and a 911 with aerodynamic efficiency of a frog cannot be so fast! But we found the proof! Here’s a video of the car actually doing 391.7 km/h. This car is powered by a 1000 hp twin-turbo flat-six engine. Kudos to 9ff.