Water wetter does nothing for cooling efficiency, it's a dielectric and corrosion inhibitor. You may however run more plain water with it than you do with coolant and that is what cools better; Adding it to a 50/50 coolant/water mix is pointless.
I was really happy with my Koyo 1JZ. They're pretty inexpensive, well made and only require you to bend to pieces of aluminum to fit a MA70 chassis.
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