how much power before stock 99 cobra injector are maxed?

I just bought a nitrous kit for my 99 cobra, as far as mods go the car has
-lt's
-o/r x
-3in magnaflow
-bbk cai
-bbk twin 65mm tb(pointless mod i know)
-predator tuner

my question is at what power level will the stock injector/ maf max out ( round about idea), i'm skiddish as to the fuel systems ability to support a 100 or 125 shot.

its a dry kit, but it pulses the injector for more fuel. Ive decided to go with an 03 tank and pumps. and some 30#ers