E60 M5 with tune and no speed limiter goes over 205 miles per hour on autobahn hitting close to indicated 340 km/h or 211 mph
This is an interesting albeit somewhat crazy video of an F10 M5 owner going completely balls out with his car on what appears to be the autobahn. The car has a tune which means it no longer has a speed limiter and the car can hit whatever speed it can reach. The owner is filming this with a camera in his hand, while on a public road, and switching through lanes at over 200 miles per hour. There is a better and safer way to do this but he does capture his speedometer.
Now factory BMW speedometers tend to read a bit fast so the accuracy here is unknown but it is damn fast. Additionally, he does max out the speedo passing the indicated 330 km/h which is 205 miles per hour. He claims to hit 340 km/h which is 211 miles per hour although there is no verification of this and the display is not set to a digital readout. For this to be accurate he would need a GPS setup.
Regardless, it's damn fast and a bit nuts.