Originally Posted by BuraQ
You are correct but incomplete. You want "more dense" air to hit your turbos for "better efficiency". A DCI setup draws significantly "less dense" air as opposed to a CAI setup that significantly draws "more dense" air
True, if you have colder air, you have more oxygen per molecule, which means you won't have to spin the turbo's as hard to get the same amount of air compared to hotter air. This all translates to efficiency.