You probably don't need an oil cooler, synthetic oils work fine well beyond the point of limp mode temps which you don't even seem to be getting close to hitting. There are plenty of kits around, Z1 and stillen are both fine. But any time you add more connectors and fittings you add more places where a failure could occur, and I wouldn't trust the oil warning light to come on early enough in the event of a leak to save the engine.
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