A couple months ago I noticed this subtle high pitch whistle sound that seems to follow my engine rpms. I can only hear it with my window down and it's not present when revving the car in park or when in reverse. Only really notice it in lower gears maybe 1-3. I can't figure out if it's coming from the front or rear of the car and hasn't gotten any worse since I first noticed it either.


Could this be turbo noises? The sound is definitely destinct from the spool coming from the engine bay though. I do have a tune and exhaust, so part of my mind wonders if I'm just hearing exhaust turbo whistle or something. But I thought I'd ask about it since it's bugging me. Here's a vid. Anyone know what might be causing this?