Rattle on acceleration: Does anybody know what this sound is?

[nickname]

The mid heat shield fell off my car

I'll post a picture when it's daylight

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[nickname]

This shield. It covers the exhaust behind the car.
Thing just fell off one day

 

[Montana Miner]

I’ve got a similar (but different) sound but only under hard acceleration/high boost. Tracked it down to the CATheat shield rattling likely because I no longer have a cat, but the shop put the heat shields on anyway.

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