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I had the same thing with my STi7. When I took it in to the dealer they told me it's probably running low on oil. A quick litre of oil sorted it out. They really do drink oil, I had to fill it up every 4K-5K miles.
you wanna hear it when you leave them for i couple of weeks and the oil has drain out the tappets, sounds like a bag of spanners for a few miniutes. I was very frightened!!!!