https://www.youtube.com/watch?v=dguUQUq8JL8
More issues. Possibly related to the whole timing pull snafu that kills the power under heat/hard use. I think in the article it actually said it was pulling timing, so the question for me is, is this by design? If so, boo.
The CTS-V3 seems to be free of these issues. Possibly mitigated by the additional room for cooling in the front end, as well as a lack of an aero package to slow the car down.