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I would check the pressure blow off valve to see if it is stuck partially open. check hoses for holes or leaks where clamped. Also if you have a inter cooler for this turbo check it for cracks or leaks a pressure check of air to the cooler then spray with soapy solution to look for bubbles no bubbles after cooler good.
check that the turbine actuator and vanes move freely and that the hose to the actuator is not leaking. This turbo has a variable vane action that directs the exhaust gas differently for low revs and alters as the engine speed increases . They seize from heat and rust or the sensor that controls the actuator goes faulty.