There is another video were the same M6 drive 336km/h according to the speedo. BMW claim that M5 has a topspeed of 328km/h and they could be right. Hopefully they are going to test the car around Nardo.
Alpina B5 Touring has a topspeed of real 319km/h according to the latest Nardo test.
BTW BMW speedo isnt more inaccurate than other carbrands.
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