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That would annoy the heck out of me….Just from the video, it sounds like a low rpm on throttle metal on metal vibration. Possibly the exhaust rubbing, maybe something else (although kinda hard to tell not being there) Do you have NPP? If so, I’d pulling the NPP fuse to deactivate a possibly noisy valve. If that doesn’t quiet it down, I’d be checking the rest of the exhaust and heat shields.
Good luck, mystery noises can be a PIA.
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