"dealer-friendly mods"
There is no such thing. If a dealer wants to refuse you warranty service repair or replacement, they can based on the smallest or seemingly most innocuous of modifications. PPK, PE, PI, basically any BMW Performance part, is supported.
That SAID....Almost all the stuff you mention is cosmetic, in which case the dealerships really won't give a shit, unless said modified part is damaged, then obviously you're on your own. Golf Tee mod probably won't fly too well.
GL.
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