Strange sound coming from under carriage. Sound file attached. Any ideas?

I've included a link to listen to the issue. IMG_6250 you can hear a couple seconds in I open the window and it comes and goes 2-3 times. A sort of "whiny rattling" but kind of neither sound either lol. IMG_6246, as underneath, it's harder to hear. Comes and goes, sometimes when accelerating. Goes away when cruising (I think). Seems to be happening more lately.

Nick

https://drive.google.com/drive/folders/1Lh94X0aIR1Wj5lQN0eSmcJiPGDNW4YSt?usp=sharing

 

Really hard to make out anything, heat shield vibrating maybe?

 

I can definitely hear the rattle in the first video, 6246. Mine makes the same noise and it appears to be worsening. I'd like to know the cause as well.

 

Hey everyone! I'm bumping this up and I've added a new video file with cleaner sound. It starts at about 10sec and u can hear it come in and out. Like a "whiny" rattling that comes in waves. File IMG_6339.

 

Sounds like the cat shields.

 

Thanks for all the responses. Yes it was a looks cat shield simple fix.