I agree with Tenchuu, you should get a new radiator. I have a greddy radiator,n1 water pump, and dual 12" fal fans, and I have never seen the temp gauge move up past where it normally is. But today i was driving through chino hills with an outside temp of about 100 degrees and the temp gauge started moving up pretty quick. Keep in mind that i was at cruising speed barely on boost at around 3k rpm. Blasting the heater for about a minute solved the problem. I think if you were at the track in this heat, you would probably overheat after a lap or two of mashing the throttle.
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