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Just as an update for anyone having this problem:
After 6 weeks I finally got my car back yesterday noise free. They replaced the bank two turbo and the flywheel in an attempt to isolate the noise with no joy. As a final step they pulled the cams for inspection and found the timing to be off a few degrees, they also replaced the valve cover. Once they put it back together no more noise. They weren't sure if it was the timing or the valve cover making the noise, either way I'm glad it is gone. Car drives amazing after having the valves cleaned!
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