An normal air intake like this isn't cooled though, and the amount of time the air spends in the intake isn't enough to make a difference in its temp in a normal street car application. Aluminum and carbon fiber are used because they are light and are cool looking. Removing the stock resonator on most Hondas will make a difference because they are restrictive. Proper tuning is still required to get the best performance though, as well as drawing in cool air from the outside rather than inside the engine bay.
I dynoed my R with just a foam filter and the difference was a peak of 2HP with the stock intake, so I know small things make a difference, but the material of the tube isn't one of them. The best intake I tried was the Comptech one on my R - it was one of the quietest too - it was plastic.
