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I have mhd for my n54, I only have great things to say about it. When I started with ots maps, they were solid and had often updates to the UI and maps.
Unless bmw built in new checks for the f series vs the e, I don't think a dealer would notice the flash as long as you went back to the stock tune before taking in.
First thing you do in those flash tunes is to backup your bin so if you need to revert back you're good to go.
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