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Did u get to the bottom of this?
I have the same turbo and when on idle it makes a loud noise. Hard to explain but sounds like you can really hear the wheel spinning.
Where abouts are you? Are u on facebook? Mine still makes the noise but is working perfectly but just plays on my mind. Would be good to meet up and compare it.
My gt30 based turbo sounds exactly the same and has done for around 10k miles, mine also has play, but was told as long as the compressor wheel does not touch the housing then its within spec
