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It's really simple, for the MAF scalling to be correct with the BMS, you need a custom tune. The stock MAF scaling is for the stock intake. Not everyone has issues, but look around on the N55 specific groups and you will see that many do have issues, some as bad as random stalling but most just have weird idle issues, etc.
Also keep in mind that and aftermarket filter is just allowing more dirt into your engine.
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2011 335i, FBO, N55+ Turbo, full E85, S55 intercooler, etc.
2015 X5 35i Xdrive
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