Noob here, I get a weird droning whine around 4k rpms and I know its not just the sound of the engine because its an abrupt noise rather than a noise thats building up. I'm wondering if its the actuator opening the 6port because for some weird reason when I got the car the guy who owned it before me had it disconnected.

Any suggestions on what it could be, I'd make a video or something but i know the sound quality would be highly questionable.

Only mod I have is a drop in k&n and my first thought would be an air intake leak or something..