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Just want to get this out there.I am seeing a lot of Turbos cracked at the waste gate flapper valve internal to the Turbo.A good way to see this is unbolt the Cat and look up into the Turbo.You will see a crack running right up the side of the flapper waste gate valve Turbo casting.Tuned or untuned does not make a differance.I am also seeing large amounts of pivott pin wear on the arm pin that controls that valve.I would be willing to bet most of them over 50K are cracked.I just did the Turbo on my with 49K on it.I believe GMs PCM recall reprograming of the PCM was also to stop the PCM from setting a PO201 for Pivott pin wear also.I can see that in the updated program for emissions