At what point are stock injectors in a 1.5L the restriction when using NOS. I'm trying to get some figures together before I even think about installing NOS in my 98 1.5L.

Basicaly I'm wondering what the rating of stock injectors are in pressure and capacity, like are they 20psi and 30gph (gallon per hour) which are the two common ratings of injectors for this class of car?