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Like the reply above.
Only company that will back you up is Dinan
You can get the Dinantronic tune installed but any Dinan dealer "independent or BMW" and if you get a CEL you can get it inspected and repaired under warranty.
Easiest is to visit a participating BMW dealer that is part of the program.
Not all BMW dealers are Dinan.
There is a dealer locater search on their website.
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