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Hey Steel. That appears to be the junction between the quarter panel and the rear bumper cover which is made of a molded polymer and reaches from the rear of the wheel well on the left side of the car to the rear of the wheel well on the right side. Polymer bumper covers are usually held on with a series of clips and/or metal brackets. The cover may have shifted or slightly loosened at that junction you are flexing due to the extreme heat (sun) on the dark paint. You should ask your dealer to look at it and see what they can do to it. I believe the body shop can probably make it better.
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2022 M240iX Brooklyn Grey, Black Sensatec, full Shadowline trim, Premium Pkg.
gone: beloved '74 Mazda RX-3, various V8 Camaros and V8 Mustangs, various other Mazdas including a '10 Mazdaspeed 3, several late model Dodge Chargers including a 6.4 liter R/T. There were others along the way but I didn't love them much.
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