I've seen a couple of threads on oil coolers causing whining noises, the car whines a lot without one. Even after you turn the car off with the clutch in it whines, and then you let the clutch out and it stops. I had the hood off of the car for repainting and it was really noticeable, this was just before I installed an oil cooler (Z1) this week, no change in sound afterwards. YMMV but I think it's the way it is.
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2011 Touring/Sport/6mt | winter: 2009 WRX
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