[Thomasio]

I think that Charlie has seen bad results w/ the smaller pulley. My car has been fine w/ the RLS Intercooler and smaller pulley, but I watch my AFR gauge nonstop. I believe that the smaller pulley is risky w/out Charlie's ECU work.

Charlie's Gotham will net you more power than a pulley will, so why not go that route?

Re: ambient temperature: yes, ambient temperature has a direct impact on IAT. At some point, if ambient is hot enough, there will not be enough airflow to cool the intercooler. For example, 105 degrees in the desert will tax the cooling system to the max. At that point, water/methanol injection will help. (On a 90+ degree day, with water/methanol injection, my intercooler is cool to the touch on the right-hand-side when I pull off of a 30 minute track session.)

Here are the things that you can do to minimize heatsoak:
1) improve cooling air both by "fettling" the intake tract and by creating a larger intake, for example Cup roof
2) improve the intercooler efficiency by increasing thermal mass of intercooler, volume and flow of intercooler, and cross sectional area of intercooler [Note: supercharger heat-causing parasitic losses are reduced by increasing intercooler internal flow]
3) use rubber mounts in between intercooler and engine instead of hard mounts that transfer heat
4) water/methanol injection, primary injection after intercooler, secondary injection externally on front side of intercooler (must be an extremely fine, atomized spray). 50/50 water/methanol will be best for most U.S. climates.
5) a radiant heat barrier / shield in between the intercooler and the engine will help a bit.

P.S. water/methanol injection cools both the charge air and the in-cylinder temperatures, and keeps heads, cylinders and pistons oh-so-clean.