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if the exact same noise was occurring prior to the replacement, it's likely not the turbo. did you also replace the vgt solenoid? or was that still from the original turbo?
are you noticing any drivability issues when the problem occurs? you allowed a relearn? are you noticing any exhaust leaks?
try running the vehicle with the vgt disconnected. see if the noise ceases. you can also try running the vehicle while someone throttles in, spooling the turbo, you listen in the engine bay and try and pinpoint the location.
the richest ones are not those who have the most, but those who need the least