I've had two GEN 4's completely shut down at 256kPa just last year. Even though they can take a map sensor that can read higher.. Its is odd that I don't see that ever talked about on here. One was E67 CTSV the other was a E38 Holden Ute.
I've got another guy with a destroked LS7 that turns 8500 on the engine dyno. In the car with the factory ECM is shuts down HARD at 8192. I've got video of it.. It was an awesome car to drive lol.