im just finishing putting in the water injection i have put one water jet just after the exit of the intercooler is this where it should be as this will cool the air or was i suppose to put it higher up, if it was suppose to be closer to the throttle then can i put another jet in as the whole sytem is going to be run by the mf2.
You need to decide what you are aiming for, charge cooling, or in-cylinder cooling.
TBH, the airflow is so huge under boost, that is doesn't make much difference where you put it, as long as it is after your intercooler. (Notice I say "your" intercooler, because I know you have a good one. If you have a crap i/c, putting the nozzle before that will help charge cooling.)
You can always add another jet up the top if you want.
TBH, if you want to take full advantage of the MF2 then you want it as close to the cylinders as possible i.e. at the plenum. This is because the MF2 will allow you to 3D map the water injection and get it to put in water depending on boost/RPM i.e. more water at high boost/RPM levels.
For it to do any real benefit like this then it needs to be as close to the cylinders as poss BUT (unless you use 4 jets - 1 for each cylinder) in a common intake location i.e. the plenum.