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I get that on a 04 plate WRX. spoke to dealer and said as long it was a faint whine then nothing to worry about. if it is loud and intrusive then the diff could have a problem..
my 94 wrx did it the day i picked it up and thought the gearbox was on its way out, then about three weeks later i drove an o3 wrx wagon we had at work and sounded the same if not a little louder