I have to ask the question, but why are you putting the factory oil cooler on the car? If anything it will make your coolant temps higher since it has to cool the oil. If you are concerned with coolant temps then do a air to oil cooler. That way the cooler oil should have some cooling effect on the engine without stressing the coolant system more.
Yes I know that the cooler will probably be located in front of the AC condenser and radiator so that won't work as well, but still I don't think the factory oil cooler is the way to go.
I did just have another thought though. From your avatar pic I see you have a front license plate. I would take that off. That will make a big difference in cooling having that on there.