I thought that, in general, BMWs do not benefit as much as others to remapping. Story seems that BMW get most of the reliable power out to you already.
MY old Jaguar was a different animal after mapping.
A good friend had his E39 530D remapped and he replaced the precats with straight through pipes. Been faultless for about three years and 40k miles now, car is on about 190k miles.
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