If you did decide to go with a non-stock pump, though, I would say you'd want a slightly higher pressure pump. The oil cooler is going to be in series (not in parallel) with the rest of the engine, so the pump is still sending oil through the same flow path. However, the cooler and associated hoses will cause a bit of a restriction in that flow path, so it would be good to have another 5-10psi coming out of the pump to override that added head loss of the cooler. (I've heard various estimates for how much head loss a cooler setup will generate, but they all seem to fall in the 5-10psi range).
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