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Have injectors been changed? You will want to have index 11 or higher. This could contribute to your smoking issue if they haven't been changed to the later version. There is an open recall or Service Bulletin to replace them at no cost.
There's also an open airbag recall and another one on the Front Propeller shaft as well. You may want to take the M to your local BMW dealer and have them check these items out and sorted out at no cost to you.
I'm also assuming that you accomplished any BMW software update before installing the tune?
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2020 X5M - Tanzanite II
2012 M3 - Alpine White |