Originally Posted by wrsbmw
In the US it's limited at about 160mph as I understand it. Haven't found out yet but that is what I read (think Stealth mentioned this). I know that on some videos where the M5 is racing against other cars, it limits at 155 or so.
The US speed limit is probably the same as the European self imposed limit at 250km/h (156,25MPH).
You have to order the "Drivers Package" to get the 190MPH speed limit. I understand that this option is only available in Europe though...