Note: I have spoken to a local tuner who allegedly worked on a turboed G37, and apparently the torque converter failed...
Now that is weird, and I don't have all the details (sounds like improper load readings -- which could all be due to a poor tune -- caused the lock up mechanism to go in and out too frequently, eventually leading to failure), but personally I would want to hear LOTS of feedback from the 7AT guys who are boosting to hear how things are holding up before I plunked down several grand on this...
Actually, I'd like to hearback from the MT guys too... just want to make sure everyhting is holding together.