As far as intake temperatures, how much of a difference does it make? I already used a hole saw to drill a couple holes in that spot and I saw a huge drop in intake temps so this would be interesting to see if it drops it even more.
You will definitely see a decrease in IAT. Although that is a nice by product of having this inlet, it was not the sole design intent to decrease IAT. By nature, it was designed to raise the air pressure to the inlet of the compressor, which gives a boost in airflow. Imagine driving 'under' sea level, where the air pressure is a little bit higher due to your negative elevation. This device creates this high pressure environment for the compressor inlet (as if you were driving below sea level, your ambient inlet pressure is higher and this makes a huge difference), you will hit target boost at either a lower turbine speed (turbo runs more efficiently as a by product of this),
or if you keep turbine speed the same (by having wastegate position unchanged, some OTS tunes do this by targeting wastegate position) you will see a boost in mass flow which equals power.