Unless I am mistaken our cars already have a power steering cooler. You can see it when you look into the grill area, it looks like an oil or trans cooler.
I think it's there to upgrade if you have wider front tires then stock and go through a lot of twisties. You should be ok if you have the stock width tires.
The Nismo oil cooler's only advantage over the stock oil cooler is that it has a larger surface area for increased heat dissipation. Wether this increased heat dissipation is significant or not is anyones guess, most likely unless you plan on racing everyday it is not.
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