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I have a feeling it's only meant to work when it's plugged into the BMW factory computer/dyno.
When you start it, no light or indicators appear. But, it's worth a try next time you dyno your M5.
It would be nice if it were some special ECU mode for when on a dyno.
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2013 BMW INDIVIDUAL ///M5 {Frozen Black/Amaro Brown/Amaro Brown Alcantara/White Contrast Stitching/Piano Black Trim}
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