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No not yet.
Not really tried to be honest.
You do have to be a bit careful with tuning these days with BMW.
A remap can always be found if they are looking, an add on box may make them suspect that something has been done but they would then have to prove it, which is extremely difficult.
BMW systems now talk back to Germany and there have been cases recently where warranty has been refused because the ECU has been modified.
Right now I personally wouldn't remap my car, however I would have no problem with a decent tuning box.
Although I had a service the other day and they updated my software, so I have left the box off since then as I know any possibility of it having left a trace (increased fuel pressure etc.) of it will have been wiped when the update was done.
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