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2005 Toyota Tundra 2WD Truck - Noise after cats

Since the repair shop replaced the 4 catalytic converters on my truck so it would pass the smog test, a vibration noise that sounds like it coming from the exhaust pipes occurs (when I’m stopped at a red light). However, if I put it in neutral, the noise goes away. What do you think the problem is?

It sounds like an exhaust component is coming in contact with the frame/body of the truck.

Tester

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