If we go back far enough into the stagea section the OP ignored some pretty solid advice on how to go about getting his car set up with the HG turbo.
I feel sorry for lilcrash that the engine has been damaged but he was warned repeatedly to drive it well off boost until he had the Nistune installed and tuned. He was pushing high levels of boost while the car was running on the stock computer with audible det prior to getting it to EFI. Most of the evidence points to his own actions.
It sucks but there is no point in crying over spilt milk. IMO drop car at ERD, agree to price for tuned car with freshened/rebuilt engine and leave 100% of the work to experts.