cold air entry is better and builds more power period. i dont care if its turboed, na or what. colder denser air aides to better atomization and mixing of the air and fuel . why do you think nos is so popular? because it does this regardless of what you use by squeezing that air fuel into the combustion chambers at a faster rate at the expense of higher cylinder pressure and temps though. but cold air will always yield more power. EXAMPLES. cryogen setups intercooler sprayers and dont forget the tried and true fuel ice cool cans that cools that go go juice as well as air this all aides cooler air fuel temps equaling more power.