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[terryb]

Originally Posted by Mark CSL

can bmw tell its been mapped ?

Mark, my old 1M had a DMS remap (415/475) and I had a boost issue once and took it to the dealer without having the map removed as DMS assured me it wouldn't be found. It was nervous sphincter time especially as they were investigating a boost issue.....

Nothing detected though on the map and problem identified as a vacuum hose which was duly rectified - happy days.

I have no doubt that if there was a major failure and the ECU needed in depth interrogation then it could have been found, but for servicing and even investigating a boost issue it was fine.