Really it is unknown, there have been a few G37 cars pushing above 500whp and around 10-12PSI. Anything below that will probably be safe, but you will have faster wear and tear on certain items. So the internals can handle it, but other items will break down faster.
A SC or a TT kit running 8PSI with the 3.7L has shown great results without punishing the engine in a bad way which gives the benefit of great power and some longevity to parts.
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