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I went through this. BM3 saves your stock tune so that you can flash back to MPPK whenever you'd like. If you had MPPK flashed, it's going to back that map up and call it the stock tune/map.
I verified this with protuning freaks before purchasing my license, but have never switched back to test their claim.
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2014 335xi M-Sport 6MT: Estoril Blue II, MHD Stage 2+ , Dinan Exhaust, Dinan CAI, ER Catted DP, ER Chargepipe, AA FMIC.
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