[AntoM3]

I know there are a ton of "weird noise" threads on here but none have proven beneficial to my situation yet. My car is making some sort of high pitched hissing sound from around 700 - 2K RPM. The best way I can describe this high pitched hissing noise is that of a balloon being slowly deflated from the open part of it. I am thinking that it is some sort of leak from somewhere. This sound is very prominent when the car is cold. The sound slowly dissipates when the car is at operating temperature; however, I can still hear it time to time even then.

I hope someone can shed some light on this situation before I book an appointment with the dealership.

Thanks in advance! - Anthony