I don't know...the sound quality (my computer and/or the video) isn't great, but I really didn't hear anything all that unusual.
Your idle seems high, and what I heard was just the normal small random misfires on decel that in my experience are typical. Much of that is probably always been there from new, but the cat-back doesn't "hide" it as well as a stock cat-back muffler. And if your plugs are colder than stock, some of that might go away with new plugs....maybe new wires.
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Jim
VR R1 FD
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