The kit includes a sprayer that sprays directly on to the intercooler.. it pretty much freezes it and dramatically drops intake temp.
About a year ago at a car show i saw a bug eye with one mounted on a fmic... there was nobody around to ask about it...
Im sure there is some kind of increase in power by reducing intake temp so much... but im not sure about numbers..??
All usdm sti have the intercooler sprayer. Ive never heard of nos spray!!!! Do tell!
I dont think the GR do. Didnt know if it was all GD