Does anyone know what this noise could be?

[blue62]

Originally Posted by Infernous428

Here is a longer video with more revs etc.. had a smoke test done and there's no leaks found. No engine codes either. Sound seems to be coming around the cats etc. Not sure where what it could be. Mechanic said he doesn't just want to start waiting for random parts replacement and to come back when a code comes up so he knows where to begin:

https://www.veed.io/view/abeb01ba-874d-4109-a15f-58720e9a1c9a

If "you" want to diagnose the cause then you need to start eliminating possibilities.
The easiest way to start doing that is to remove the fan belt (serpentine belt).
If the noise persists after removing the fan belt and running the engine then you will know it is not anything driven by the belt.

If the noise is gone after removing the belt then it is something driven by the belt.

Your not going to get far by just posting video's and asking random people or random mechanics their opinions.
Diagnostics has to be done, that basically boils down to a process of elimination.

I notice a lot of liquid dripping from under the car.
Whats going on there.???

What modifications have you done to the car?
Doesn't look like stock exhaust or it isn't bolted up correctly.