I can't find the thread anymore but apparently for the wastegate rattle the 'fix' was to reflash the car to keep the WG partly open, (i.e. less boost/power and more lag). There was even a dyno run documenting this, where someone had lower power than their baseline after the 'fix'.
Personally, I would be very hesitant to complain about the WG rattle.. Or at least I would do a TON of digging on the forums before hand. I'll take some noises over reduced power any day!
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