Bad Sound from Driver’s Side Rear

[Z4JB]

Guys I’ve attached a link, any advice would be good. There’s a hissing sound when the engine is idling from the driver’s side rear, the idle is smooth and the engine sounds good, there’s no lights on the dash. This is noise number (1). You’ll hear this in the video.

However, when revved it sounds a bit like air or something rushing out. This is when I rev the car and take my foot off the throttle, as the revvs creep back down noise number (2) appears.

[youtube] https://youtube.com/shorts/TbgPME_IEy0?feature=share[/youtube]

[Zulu4]

To me it sounds more like something vibrating at its harmonic frequency (but that may be just the quality of the audio).
Are all the exhaust hangers OK ?

[bigwinn]

Agree I’m hearing metallic resonating?

[Z4JB]

Thanks gents, I am putting this down to the exhaust some way or another. There is however still a hissing sound that I can hear at the rear drivers side of the car at idle, I don't believe there are any holes in the exhaust, however given it is not standard (not put on by myself) the hissing sound may just be the sound of gasses being shoved through it. By default this exhaust is louder anyway it would seem.