Originally Posted by Pete_vB
The top speed limiter is one area where the Germans can be less than precise in my experience.
When I lived in Germany I had an E46 M3. I attempted to find the limiter many times and was never successful, despite the fact that I saw 290+ kph indicated (yes, the speedo was a little optimistic, but not that much).
While the listed limiter speed is generally 250 kph, your mileage may vary, as they say. Especially on older Audi RS and BMW M models. Today manufactures occasionally offer a raised speed limiter as an option, where previously they just did it on some of the faster cars and didn't tell anyone (nudge nudge, wink wink). German engineers get a little competitive sometimes...
October 2010, when some journalists had driven the 1M test mule:
"BMW claims that this 3308-pound machine will sprint from 0 to 62 mph in 4.3 seconds.
Top speed will be governed to 155 mph, but there will be an option to raise Vmax to 168 mph, as with other M cars."
Later, BMW seems to have muzzled 1M performance information in official figures releases (no trespassing on the M3 territory):
"BMW engineers and execs have been quoted several times saying things like «it won't step on the M3's toes»"
Back in those days, they also indicated that a CF roof would be optional - too bad it didn't make it to the final version. Time and budget constraints, you know.