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My M3 consistently accelerates up to 170 mph on the speedo before the power cuts out. Power isn't really "cut", but it is limited enough that you can't get past 170. There is still plenty of power to keep accelerating, so it is a noticable event when the speed limiter steps in.
BMW claims it is limited to 155, so I would tend to believe that the speedo is just off by 15MPH at that speed.
Here are a few pictures of the speedo at the point power cuts out...(on the Autobahn, of course)
EDIT: This is a US spec car with no mods
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