This is a never ending debate.
You will see lower IAT's with anything other than stock. The whole hot air intake is false. I have run an eBay intake for approx. 6 months on my car. It was a short ram just like the AM one. I now have a Steeda CAI, but it only offers a cleaner looking quality piece than a shiny piece of intake piping.
Sure the metal may soak heat, but how long is the air staying in the pipe to get heated up? Seriously. The bigger the piping the lower the IAT because there is more air able to travel, thus not allowing for heat from the pipe to heat it as fast as the stocked ribbed intake rubber thing.