What is this noise?

The sort of squeaking noise in the linked video. It sounds like it’s coming from the exhaust, but nothing appears to be loose or rattling. My deep belt is brand new and silent, the noise comes from under the middle of the truck.

https://youtube.com/shorts/weSjZqH7Y0w?feature=share

 

Can't hear the noise, but I was getting weird noises on mine,,the under body aluminum exhaust shields were coming off, and the shield around the cat converters were also loose..

 

It’s sort of a chirping noise maybe this is more clear:

https://youtu.be/IfJdWCaL7JQ

But also maybe this is just how tundras sound and I’m splitting hairs for no reason haha

 

All of the underbody panels and heat shielding are rock solid, but I’m wondering if it could be an exhaust leak

 

I like it, sounds like a helicopter.

Maybe a water pump bearing going out?

 

I want to sanity check today, but I think I fixed it! I saw some water drip out of the flange joint behind the cats and the pulsing noise was in tune with the exhaust even though it didn't sound like an exhaust leak I've heard before. I swapped out these gaskets and it seems to have quieted down. I also tossed in stainless hardware so I don't have to sawzall my bolts again.