I have the same problem with a 2017 built on 5/17, just seems to be getting worse. Garage queen driven on weekends for fun with about 2700 miles or so. Showed my dealer and he is not going to do anything at all, so I plan on bringing to GM's customer service attention. It's noticeable and when I compared to some new ones on the lot, they don't have it. I checked the bolts and they were all about the same tightness, not much at all actually.
It's hard to convey thru photos tho.
Read that several here have had theirs replaced, so GM knows that they have an issue. Seems to be prevalent in the black painted ones VS the exposed carbon...
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