I have an Abrieb chip which was fitted to my last 520d 10plate, (and 520d before that) it also was a company car, but Ive moved company and now have a 535d, it sadly doesnt work well on it, but if you are interested, its for sale at £90.
If you look up Abrieb, its recommended on many forums, I never had an issue when removing for servicing and its a very small neat aluminium box :-) Similar output (was as quick as my old 530i.
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