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With twin GT30s you'll be pushing over 600whp and that's on low boost. The engine wouldn't hold up whatsoever at those levels at stock compression.
VK 56 is a low compression engine (9.8:1) and stock G37s make 600whp on high compression (11:1) engines. So i think it would handle some boost (10-12psi) very well. I have yet to hear of anyone proving either of us wrong though. So i guess we agree to disagree until someone tries it, so far i have seen Titans hold 9psi and over 500whp on a stock bottom end however I think it was a single turbo and i am not sure of the size.