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No. I was watching my gears today and the whistle is the loudest right before it shifts, then comes back quieter and louder again before it shifts. This is in the bottom gears, no turbo boost.

I have this same whistle. Didn't show up until I had 500 or so miles. I've had a few ecoboosts and this is not the turbos. Seems like it does it whether running on gas or electric. I'm wondering if it has something to do with the transmission. It's driving me nuts.