If they are applicable, there are meth injection threads over on Hellcats.org. The one take-away that I got from the posts is that the Hellcat guys don't run meth injection much because they are afraid of a delivery failure resulting in a meltdown. They (along with Dodge) concentrate on bringing in outside air and cooling it with the chiller. Which is basically the A/C system cooling the intercooler. Much more complicated, but considered to be dependable. Then they insulate the blower intake from the heads. Etc, etc, etc.

Can't you at least get ambient temp air to the engine?