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From what Ive read it is a symptom of excessive shaft play caused by bearing wear, and its definitely not something exclusive to these engines. I've been hearing it when the oil is cold for a month or two now, and I started seeing a lot more oil in my intake shortly before that.
I'm on the stock tune ATM and I still hear it, but I've had dps/fmic/tune on the car for ~25k miles. This is on a car with about 113k miles and original turbos. Rattles like crazy too, but such is the n54 life.
Now I'm just babying it around til I get my used replacement oem CHRAs in from RB.
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