H there,
I am in the process of fitting a nitrous intercooler spray on my car. It has a forge FMIC and think it will reduce temp levels and therfore power will increase. I also have a performance meter and will take readings before and after to see if there really is any performance increase.
Although i would advise against a carbon dioxide intercooler spray as although cold, some might get into the air intake and actually decrease horsepower. This is due to co2 depriving the normal air of its oxygen levels, (thats why its is used for fires) and as a result the engine cannot receive the air it requires.