Insurance: Absolutely no issue at all, most of them couldn't give a damn.
Warranty/BMW Assist: Could be an issue potentially, maybe depends on who you get to speak to and what mood they're in..! Mewster makes some good suggestions of examples.
Handling: RFTs are more expensive but the car is set up for them and I'd suggest (respectfully) that you look at all the impacted options - suspension should be stiffiened for a start.
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