Air Leak/Hissing Noise From the Front

[spacecase]

I've been hearing a slight hiss coming from the front of the vehicle that I don't remember hearing when I first purchased the car. Sounds like a small air leak/hiss and it's coming diretly in front of the engine by the throttlebody. I think a valve went or something but hoping I can get some suggestions (or maybe it's normal?). Have an appointment with my audi service but it's a month out. No codes, only thing I've noticed is my MPG has been pretty low for what I thought it'd be for this car. Video below.

https://youtube.com/shorts/BuyjROYcIPs?feature=share

[spacecase]

If a mod sees this, please delete. Posted on wrong platform (B9 S4 in vid).

[ForceOfG]

Good way to find air leaks is spraying some soapy water on any fittings. If you see bubbles start to form rapidly that's where the leak is. But I also have the same exact noise in the same exact location just behind the throttle body (B9 S5). I've yet to actually find any actual leak though.