Sounded like a Diesel engine until the car got to warmed up temperatures. It’s a pretty common sound, just YouTube exhaust leak sound. You’ll see what I mean, it literally sounds like a big ass piece of paper flapping super hard in the wind.
Then you just trace down the leak, i could hear it was coming from the engine bay and not under the car. So I looked with my phone and checked the downpipe flex pipe. It was clean then I used my hand to feel around for any air coming out, I felt air bursting out st the back of the motor by the manifold. I then took my phone and recorded video with flash and tucked it up behind the motor best I could. Stopped and watched the video and you could see the crack very easily.
As you can see in the picture the crack is almost 360 degrees
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