Is that would be your last mod for your Z?
Normally the ECu would re-learn and adjust itself. I have intakes and full exhaust upgrades I should be running lean by now been driving the car for 30k miles and no tune yet car still runs great.
Having your car tuned will bring the best efficiency for your mods.
My suggestion do all your mods intakes,exhaust then have your car tuned by up rev or ecuteck.
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