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Pretty sure thats your wastegate which opens to limit the amount of boast your engine receives
If the boast goes over the factory pre set level (11.5psi i think) it will open.
If your concerned its siezed maybe remove the clip and see if the gate moves freely without the actuator attached.
I think you need a vacuum pump to test the actuator though but others here might be able to comfirm that.
 
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