Well, I don't want to point out the obvious but............one of the reasons for joining and paying to join the GTIROC is because it has a large knowledge base and you can bet that in the past 5 years (or whatever it is) the same questions have been asked over and over and over again.
USE THE SEARCH BUTTON !!!
I searched for RX7 injectors and am up with some interesting reading. It would seem you have to make sure you get the right Rex injectors as some are high impeadence and the Pulsar needs low, also some need a 11mm hole in the rail and the gti-r uses 10.5mm. Do the search and see for yourself