output, have been known to fail early. The later style injectors seem to outlast the car's life. I have the later style injectors in my '94 NA and they original with 162,000 on them. Since you don't really have that many mods yet, I wouldn't recomend jumping up to 615cc's just yet. I'd stick with 370's, but the newer style on the 300degree rails. When you upgrade turbos/intercoolers, then you can talk about an injector/ecu upgrade. It's going to be kinda expensive, and recieving no real increase in power. It is a preventative measure though and will benefit you if you plan on keeping your z for a long time/put plenty of miles on it.
