I think the cost of and the mods of going to a saturated injector are going to exceed the cost/labor of installing the resistor box. Where are you going to find a fuel rail for those kind of inejctors that will work on a dsm? If you really want saturated 550's there are tons of guys on the rx7 forum practically giving them away. Wiring the resistor pack is not that difficult, here's a post from another thread by Stingray90:
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The IRP pack is not as hard as it seems IMO. (1.) First connect the IRP to it's harness you got from your doner car or whereever. (2.) Then open up the wiring harness that runs across the intake manifold. Look for the THICKER (+) yellow wires (All yellow w/black, red, green, and white stripes) the thinner (-) wires run to the ECU (Do not touch these). (3.) Cut them & solder the half running to the injectors to the 4 black wires of the IRP (YB-BY, YR-BL, YG-BW, YW-BR) I don't know if it's necessary to put them in that order since the ECU decides which injector to fire, but better safe than sorry, (if anyone has did it differently w/good results let us know) (4.) Connect the red wire of the IRP to the opposite half of one of those THICK yellow wires that you cut. NOT the half you connected to the IRP! The 3 remaining cut yellows get heat shrink put on the ends of them (Not used). Seal it, wrap it, bolt it call it a day!
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Installing a turbo 4g63 into an nt 4g63
