It's irrelevant what size your oil filter is on oil pressure. You can run the engine with no filter (with proper holes blocked) or a 5 gallon filter and once it's full of oil it will still have the same oil pressure as when there was one.
The stock oil pump pressure relief valve keeps the oil pump from producing excess oil pressure no matter what volume the pump is pumping into and it's set at the factory oil filter volume has no effect on the valve.
The pressure relief valve inside the filter they are discussing in your links is just internally to the filter and the valve opens when the filter is TOO CLOGGED to continue operating safely inside it's burst rating it is NOT controlling engine oil pressure it is just determining which path the oil takes inside the filter, like normal operation with unclogged filter or bypass the filter element when the filter is clogged only.
so why, when i fitted a smaller K20A oil filter to my system, did the oil pressure increase?
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