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My BRZ does this, and to my ear it's front-end located, possibly more on the left than right. I only notice it when I get up to speed, but found it hits heavily in 6th cruising in the 50's. My car's at the detailer for two days getting Opti-guarded and window tint installed, but I'll do so more evaluation and post back what I find. It's not wheel bearings, those are constant, more of a whine, and increase in pitch and intensity with speed. This is definitely something harmonic going on that relates to the speed of the vehicle.
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