It is possible to get just an e-tune which you upload (flash) via the provided cable. This will also allow you to flash back to the stock ROM if needed. This would not require you to not do anything unless the tune is off. You would check the tune by going to a dyno or installing a wideband (measures (A\F). You other option is to get the Tuner software and if you are mentally capable of tuning a car and know how or what parameters to change this will allow you to do that. That being said, you are more apt to destroying (engine) something if you have no background or experiences with gas engines and tuning.
Your best bet is taking the Z to a certified UpRev Pro Tuner location and having them tune your car in a controlled environment and by someone competent in engine tuning. They should have the appropriate equipment to log data and safely perform your tune based on your modifications.
If needed the Pro Tuner can reflash the ECU back to stock.
If you have any questions let me know.
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