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I also had this issue, there was a faint (but noticeable) noise that came from either the exhaust or engine bay at around 2k revs (+/-200revs) under small throttle openings (usually happened at around 60kmph in 4th gear, 6MT, going up a slight incline). Sounded in my opinion like some metal flakes or bits vibrating around and hitting the walls of the exhaust at that resonance.
I had my secondary cats taken out a wile ago and thought that may have been the cause. Just kind of lived with the noise as a few people had reported it over the forums.
I did however end up taking off my axle-back and giving it some juice with it off (sounds mint btw). I put the modified axle-back back on and haven't heard the noise since.
Not sure if it helps but that has been my experience with that noise, if it is the same noise you are describing.
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