Wim-

No you goon...

They are tall thin intercoolers that go right from top to bottom, bumper AND grille.

Most modern intercoolers are purely bumper mounted (so dont have as much surface area) but much much thicker.

The one on my car is only 300mm tall but 165mm thick, and good for well over 1000bhp...

Frog-

Yea, that would work, but would be fucking expensive, wheras water is free. Also more complex as would need to add the corresponding amount of fuel as there is Oxygen in Nitrous...