Cold start metal rattling noise

[JadeMyWorld]

I typically remote-start my Bronco, so I didn’t notice the cold start noise until recently. It sounds like a metal rattling noise from the exhaust, but I could not hear it from underneath, nor could I find any loose parts.
If you listen to the video, the noise is more obvious starting from 30 seconds and disappears at 1 minute.
I have the Borla style exhaust.
Has anyone had similar experiences?

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[Bschurr]

If you didn’t find anything loose or rattling around underneath, perhaps give the exhaust a few good yanks back & forth to see if perhaps there is a loose baffle in there

 

[JadeMyWorld]

If you didn’t find anything loose or rattling around underneath, perhaps give the exhaust a few good yanks back & forth to see if perhaps there is a loose baffle in there

Thanks. The baffle is in the muffler, right? The noise is close to the front wheel.

 

[23OBX2.7]

Could be the "normal" wastegate rattle

 

[JadeMyWorld]

Could be the "normal" wastegate rattle

Good point. I will check the waste gate later to see if it’s loose. It sounds similar to some of the F-150s with the wastegate rattle.

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