extract taken from my site. - Technical section.
<< As air gets colder its oxogen count rises because of the well known fact "colder air is denser air". So to put simply you can fit more air into the engine with the same intake and get greater performance. A cold air intake sucks air from the much colder air outside the confines of the engine bay as where the short ram or stock intakes suck air from the hot underhood air.
hope this helps.
