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I had an 05 Outback and in chasing the dreaded P0420, I was "thrilled" to discover that there were 3 cats and 5 oxygen sensors. Somewhere there is a Subaru engineer busting a gut with laughter... and a parts manager handsomely salaried.

That’s an interesting one! A chipped tooth will make a rotational clicking noise that’s speed related and only when in the chipped gear. That noise sounds like something is grinding - and interesting that it’s only in one gear. Other thought is that it’s multiple teeth that are damaged - unlikely though as the gear would most likely strip as a result, but anything is possible. Hopefully it’s something simple.