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I haven't got it in writing but I'm very confident that the onus would be on BMW to reject a warranty claim on the engine and drivetrain and prove that my mods caused it. I fully accept the other issues that you mention because they could quite plausibly be caused by my modifications and I'll take my chances there.
It's strange that you're concerned about those mods and yet you'll probably do the DMS mod as that definitely does affect your engine and drivetrain and they are by far the most costly parts of the car and also probably more likely to go wrong.
Cheers
Jack
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