Wastegate pressure on a factory turbo (factory wastegate) is about .5 bar or 7psi.
Does the car drive any differently, may be an issue with the hose to the boost gauge if not.
If it feels slower, Rossco's probably right, boost leak.
Does the car have an aftermarket ECU? Or Ecutek?

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i