I am no expert, and its hard to tell, but it does remind me a little bit of my catalyst rattle. That was also throttle sensitive. Can you get it to make that noise when its parked up by revving it?
My advice is, get under the car, check all heat shields, and give both cats a little whack with a piece of wood or something and listen for any rattles.
At this age the cat rattle is so common it would be my first guess. At least its worth ruling out car rattle or loose heat shield.
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