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The stock heat exchanger is more than adequate for the stock boost. When you increase the amount of boost you need to uprade the heat exchanger in order to keep the charge temps in check. Heat is the enemy of these engines and this is definately worth it in my opinion. Just fill it with the same Ford antifreeze that is in the radiator. Using an upgraded reservoir and packing it with ice is good for a quick quartermile pass before it melts. The stock reservoir is otherwise adequate for daily driving.
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