Few weeks back at the end of my track day my engine started making noise and it does sound basically identical. What you can do to isolate the problem or at least find out which cylinder has a issue, let it idle and unplug each coil one at the time, if the knock still there, plug it back in and go to the next one until the noise quiets down. Mine has a issue in cylinder #5. I’m in process of setting up my garage with a lift so it will be few more weeks before I tear it down.
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