This is the way I see it. The seal on your turbo is probably bad. I am on my second TD04 and the seal is going on this one just like it went on the first. I never see any smoke out of the exhaust until I hit full boost pressure. Then I can look in the mirror and see a little smoke behind me. I would suggest that you make a weekend available to swap this turbo with the one in your garage and see if that fixes the problem. At the least you will get a good look at everything once the turbo is out and out of the way.
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"A power nap is when you sleep on someone who is weaker than you." - Dimitri Martin
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