F15 - Hissing Sound

[cals]

Hi

Looking at a F15 X5 3.5i with 80K miles.

I can hear a strong "hissing" sound in the rear, like pressurized air escaping out, could not find a source (the car has NO air suspension, No 3rd Row, it is not the tires), will try to post a video here. Any suggestions/ideas? Is this "normal"?

Thanks,

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

[SYM4]

That's normal mine does the same its coming from the fuel pump

[anshudutt]

I have the same noise.