well they did fit intercooler sprays to some of the imprezzas. Guess it would bring down temps but not sure how practical it is day to day.
Chargecooling is fit res tank and it never actually goes down, just pumps and recirculates in it's core between intercooler and throttle body so it's the closest to fit and forget.
Water injection I used to run on my 620Ti race setup and it certainly does work, but I can't be bothered faffing about with a seperate controller to manage it as it's another thing that's proportional to boost and it was better on methanol than water so very much a track day thing I found.
Be interesting to see what temps come back from yours and mine on it's new blower. I certainly saw a 15-20 degree temp drop like for like after fitting that new intercooler which as you say is smaller, but thicker and the core design is much more efficient.
Like it in black I must say,,,,very stealthy
