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I have this noise too and was worried about it, specifically mine also appears at 2500 -3000 rpm under light load in 3rd gear (but not in 1st or 2nd). In 4th gear (or higher gears) road noise and air aerodynamic noise may be covering it as i cannot hear it and it is slight in third gear.
It seems there is a moderate consensus that it's just resonance from/through the air intake or natural resonance from the engine with the air filter. It would be nice if someone could post an audio file of it.
I will try if i get a chance.
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