Many will say it makes no difference because of the small amount of time the intake air spends in the tube, giving little time to transfer heat to the air. Of course if that was 100% true, then 'cold air sumps' are a total waste of money.
I have a spare intake tube I intend to drill for a temperature probe. Point is, we need not guess.
The key feature of most "cold air" manifolds isn't cold air. It's an enlarged mounting flange to accommodate a larger fuel servo, usually a jump from the RSA-5 pattern (2.3125" dia) to an RSA-10 pattern (3.4375" dia).
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