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Maybe you are getting detonation in the higher gears. Most cars will build more sustained boost in higher gears. What kind of fuels do you use?
Or maybe you have a boost leak or BOV problem. I would take a good look at your charge pipe. Maybe even remove it and check it for cracks. Also... the vacuum lines going to the wastegates have been known to blow off at the turbo(s).
Dack
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