Here is some knowledge to settle the hot air intake discussion.
The main disadvantage to all of these is the fact that they are drawing in hot air from inside the engine compartment. Intake air temperature is very important whenever performance is a concern. It is a general rule of thumb that a engine will loose one horsepower for every additional ten degrees that the intake air temperature is increased.
Here's the whole article
ISUPAGE; Performance Intake System Basics
I rest my case.
