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If the adapter is on Bimmercode's list of approved devices for the G-series, it should work fine.
I've not had the dealers give me problems with any of the (minor) coding that I've done. If you did something that changed the engine operation, they may take issue. Keep in mind that many of the things most people tweak are the norm in many other markets, so they were done where you are to meet federal requirements or other safety situations. Change something, and someone ends up getting hurt, and they could tie it back to a change you made, then you might have a problem. That would also apply if what you changed affected the vehicle enough to cause an attempted warranty claim when it broke something.
IOW, for most anything you might try, unless you brick your vehicle by changing something you shouldn't, it's generally not an issue.
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