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You kind of asked these questions in reverse order I think, but I will
answer them in that same order. 1.) The 555s or 740s are fine for any mod level, as that is the max they
flow, not an indictor of their constant flow rate. If you had 740s and the
rest of your Z was stock you would just never hit maximum duty cycle of
the injectors. I would look at the horse power and boost (boost including
Nitrous, if you are going that route) you are looking to attain. This will
determine the head room you need out of the injectors. But, me
personally I would look at which injectors of the two have a better
maintence record. I have been having terrible luck w/ my 555s lately.
They keep going bad. But, you have a 95 so I believe those are
pintleless which are supposed to be better than my 93, but don't quote
me on that. Research it and see. 2.)If you have an upgraded ECU, it should have a sticker on the outside
that says what program it is running. If not on the outside then open it
up and look at the actual eprom and see if there is a sticker on it. If
there is no sticker and your eprom is soldered in and not socketed, then
it is most likely the stock chip (IE 370 injectors.) You can also do search
on the color of the injector tops. Then you may be able to tell by looking
at the tops of the injectors as to which ones they are. hope this helps.
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