I've seen just a click under 160mph on my speedometer in my X5 4.8is which I did a few weeks ago on a quiet Autoroute. I was following a Ferrari 355GTS at the time.. I've not felt any limiter kick in so I would suspect it will be like on the M3/M5 where it only intervenes at around 167mph. The 4.8is will be limited more by air resistance than any electronics but I would estimate that allowing for error it will manage 155mph quite comfortably.

I reached 160mph (indicated) in D by the way.

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