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I relocated mine because of the small 3" oil filter gets clogged up very fast and doesn't flow. I use a wix 1" oil hole and 7" inches long with a 14 micron rating to really clean the oil. That with the T6 oil I can go 10,000 miles on the oil and filter change if I want.
There are 3" diameter cats, used in large trucks, I used them for my cat/muffler for my 79 to be street legal. They are expensive but flow like gang busters.
Yes definitely plug the holes, example photo stock 400 with factory block off. Missing plug in one side from the factory and factory block off not working as noted by the junk in the runner on the small jet side.