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The blower must be spun at higher speed in order to pull air through the restrictions, and that introduces additional heat,” Cliff says. “Our rear-mount tube is positioned in a way that lets airflow at the rear section of the engine compartment serve as inlet air. The only time this air is actually hot is when you're sitting at an idle. The reality is, air is colder at this location and has a straight shot into the blower. When measured, inlet-air temperatures were not much higher than the ambient temps at the front of the car.