It all depends on what you want from your car. However, i think GTR injectors are low impedance and GT-T injectors are high impedance. (can someone confirm this) If you think the power bug will bite, even if you just make the switch from 98 to E85, i would just go for some ID1000's. They are relatively easy fit for a neo from what i have read, plenty on the forums about fitting them. If not, just get a set of direct fit sards, nismos (insert brand here) 550's it will be a lot easier in the long run.