Anyone recognize this rattle when accelerating? (1 Viewer)

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I'm thinking exhaust leak.

I had an O2 sensor that the nuts rusted off and the sensor would blow out of the hole during acceleration and fall back in when I let off.

I cleaned the studs, ought new nuts and a gasket, slobbered some copper anti-seize on the studs and reinstalled!
 
Could definitely be that, po420 code came up a few times, I cleared it and put a new catalytic converter on, it does smell dramatically better, but that could be it, it does smell like it's right behind the steering wheel
 

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