Depends on what you're after. If it'* the intercooling effect, pre-blower is ideal. But be warned, it'* very easy to inject too much. I'm running a fairly small nozzle, and had problems last summer with it. Spring will be bring a 50/50 water/methanol mix, to hopefully solve that problem.
Read my sig
This is my 4th system in this car alone. All home-built, but I do have a bit of experience and knowledge with other applications. A friend at work has an Aquamist 2D system on his VW Jetta with a Neuspeed SC conversion (Eaton M45.....cute little bugger). He'* a member here as well because of the Eaton commonality. Greyhare is the name.