GT1749VA: Max. Boost Pressure

Hello everyone,

I've already used the search function, but I'm not finding much information about it.

Can anyone tell me what the maximum sustained boost pressure the GT1749VA turbocharger (130 hp) can handle at approximately 4000 RPM?
I believe the pressure in the middle section is easily 0.3 bar higher, but what about the pressure at the top?
Is there any air left in there?

Thank you very much.

Best regards,
Alex.