Just a word on the thermostat; I 'm in Las vegas and some of our race & trackday weekends will see temps in the 105-112 F range, I run a thermostat and with the 3 core GX radiator have no issue with cooling. Now back when we had the 2 core standard rad (recored) once the car went over 4000 RPM it would run hot, to the point of me running the heater to keep the car in the 7/8ths range. Put the proper thermostat in, the car will be better all around.