| I'm possibly in the same situation. Taking my car in tomorrow to have the injectors checked out. I've been thinking about what if I have to replace them and now thinking about getting the JESC or Nismo 550cc newer style injectors (3 year warranty for the JESC injectors) with a 300 Degree fuel rail (another maybe) plus either CZP, Z1 or ZTuner ECU chip to complement my Stillen exhaust. As for ECU upgrade, seems to be a toss up since most of what I've read is subjective on the subject. I'd like to read an objective comparison of ECU upgrades that's current and and maps out the pros and cons. Right now it seems that ZTuner may be the most flexible and I can tell them what I'm trying to obtain and they will tailor the chip to my needs. Another thought I had was the WinFactory top feed rail with the Bosch EV14 LS7 injectors. But I was told that these injectors aren't completely compatible and you can expect some hesitation issues and was steered away from using these by a local Z shop and to go with the newer style side feed injectors. I'm just looking for a streetable upgrade with just a bit more power, but nothing overboard. I found that Z1 and CZP prices are basically the same. Or, if you're looking for OEM I'd go to Courtesy Nissan for my OEM parts needs. What's more important to me is customer service and getting the parts shipped promptly. All said, I'm still not completely set on what to do either. Looking forward to hearing more from the Z experts on this forum answering your question.
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