Right now I have the back of the MAF drilled & tapped, & nozzle screwed in there, with the direction of spray going towards the top of the TB.

Has anyone experimented with placement of the nozzle, & spray pattern? Towards the top, bottom, or directly in center of the TB?

 

Any orientation other than pointing toward the center of the airflow would probably result in unequal distribution of the N2O and fuel (assuming its a wet system since the nozzle(s) are aft of the MAF) to all the cylinders.