Check the forced induction section of the forum, they will have more answers. Also, check with the G37 owners that have gone TT, they have had more time with the engine than we have.
As far as I know you can safely run 6-8 psi on the stock internals, you'll just need to upgrade the fuel system and electronics along with all of the standard turbo parts. I believe GTM will have a full kit that includes every piece you will need, but don't quote me on that.
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