Alright. Quick Question.

Is it more important to have larger secondary injectors, or could you get away with smaller ones if you replace the primaries as well?

Let me give an example...Which setup would be better, or are there differences I'm not thinking about?

550/850s
or
680/720s

That sort of thing. I'm going to pick up a set of 680s but I'm not sure if I should put them in the secondaries and be done with it or buy a set of even larger injectors and put them in the secondaries.

Mods will be: BNR streetport, FMIC, full exhaust, intake, stock or BNR upgraded turbo, S-AFC, FD Fuel Pump, etc.

 

Once the secondaries come online all four injectors are fired at the same pulsewidth, so it doesn't matter what sizes they are as long as the total amount of fuel being injected is enough.
If you picked up a second pair of 680's you'd have enough for a safe 360hp.