Those of you who have water/meth systems.
Where did you you install the injector?

I thought of instLl I the plastic intake tube - top of engine , before the temp sensor.

Then again maybe down lower - right after the rubber tube connects to the plastic tube coming from the intercooler.

 

I think the single nozzle is usually before the intake sensor in the manifold, and the 4 separate nozzles, can be placed in the intake manifold, which is what I would do. But, I'm just speculating, I'm sure someone will chime in.