There is no OEM oil cooler. Stock thermostat and radiator are fine for a street car. I am still on stock, never had a problem. But you are in a hotter climate than me. It probably comes down to how hard you intend to run the car.
Nissan hasnt assigned any of those items a specific boost pressure rating, so all you can do is proactively upgrade things based on recommendation, or wait until something falls short of your expectations and upgrade it then.
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