Dude.... you're wrong. Go reread what you saw.
1- molecules of colder air packed more densley than those of warm air.... thus you get more 02 molecules into your engine per cubic meter that is drawn through the filter resulting in greater efficiency.
2 - the velocity of the air in the tube has nothing to do with the simple length of the tube as opposed to the shape of the tube, and the harmonics that accompany the lay out. A shitty CAI will get less gains because it can't draw the air in as fast as a high quality and tested CAI even if the high quality CAI is longer. Aside from that the properties of fluid transfer say that the same vacuum applied to the ends of 2 pipes with the same cross sectional area will generate the same velocity of air travel throughout the pipe once the entire pipe has moving air particles flowing through it regardless of overall pipe lengths. Go check your sources.

-DaBat