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It's definitely inconsistent - didn't make the noise on my way to work this morning, noise was back as I drove home for lunch. Real high pitched, gets higher pitched as I accelerate & gears shift up, lower pitched as I let off the gas.

Any luck nailing down what this may be? Just got my ‘21 Powerboost, and around hitting a couple of hundred miles mine started making a noise just like you have described. I’m almost certain it wasn’t making the noise when I first brought it home.