What’s that sound?

My car has 67k miles on it. And I’ve recently been hearing a noise coming from the back of my car, right beneath the backseat. It’s almost like a cracking/popping sound. Kind of like Rice Krispies or Pop Rocks candy. I’m worried there’s something possibly wrong with the battery, maybe?

I also hear it when I’m riding beside other cars. Anyone else hear anything like I described above? Any advice on how to stop it?

Thanks in advance.

 

The sound increases with speed. It sounds almost like a torque wrench.

 

Welp...that narrows it down lol I told an advisor at Toyota about the issue and he said it was normal...which I'm certain isn't.

Hopefully its nothing major, and can be fixed somewhere else because it hasn't effected the car in any way so far.

 

Going to try that soon.

 

That would cause the sound to be heard in the car as well?

 

I managed to record it, if anyone cares to hear it.

 

My tires in the front are about a 7-8 on tread. The back are terrible, I know that much. I can check for stones and whatnot in the morning. You didn't hear the other sound? It's pretty consistent at the :53 mark until I hit the back at 1:15

 

So I was told that it's the catalytic converter by one shop, then I went to another and they said it wasn't. If thats the case, would I even be able to drive it the way that I do? The performance isn't effected at all from what I can tell.