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The N20 like the F30 N55 has a new DME system so not much is known yet about how the tuner detection system works. The good news is the BMS Stage1 tuning is pretty mild and does a good job of keeping the DME thinking it's making around the stock power levels. Where you run in to problems with tuner detection is at higher boost levels where you start to max out your fuel trims and hit other plausibility checks BMW has embedded in there.
Mike
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