I assume you have a 3T GTE? 10 psi with the stock set up is fine.
I have an intercooler and Garrett GT25 turbo running 14psi and still on stock internals.
I think the limit of the stock internals is about 18psi if you have an intercooler and good tuning. Over that and you need forged pistons and better head gasket/bolts at a minimum.
Also the limit of the stock injectors is around 200hp.. thats about 40hpo more than a stock 3T GTE, so you need more fuel too...
Stock compression for a 3T GTE is 7.8:1 which is good for a turbo application.
Cheers,
Simon
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