This is true and even with a turbo the cooler the air starts out the cooler it will stay. I think the main idea is that cooler air is more dense and therefor contains more oxygen. But I do think there is a big misconception out there that as long as there is a pipe and a big filter it is a cold air intake. But the truth is, if it is sucking hot air from the engine bay it is not doing much good and is not a cai.
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