Got the resolution today, actually. They said they've been searching for it a long time and now think it's the fuel pump. They compared my car and noises to a new Z and agreed that this noise shouldn't be there, so they've ordered a new fuel pump under warranty.
I'm praying that's what it was and that I'll be able to enjoy driving the car again!
Did anyone else here had the whine traced down to the fuel pump?
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