Weird sound from in cabin

[RapidRed904]

So car originally had a vmp odin on it, ran phenomenal had a very slight hint of a weird sound coming from the passenger side that I could really only hear from the inside and now I’m back to NA prepping for turbos, car has headers and a fore L2 fuel system on it still and the sound is very noticeable now. The FIC1000’s I have aren’t the quietest and neither is the DI pump, motor is healthy just looking for advice on what this could be. Also the sound cannot be heard from engine bay and goes away with higher rpms.

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