As far as needing a tune I have seen my share naturally aspirated Z’s dyno over the years and you will not know any conditions without using a wideband. For just a cold air intake and exhaust installed your engine pcm will compensate and adjust for these modifications easily and conditions will not be dangerous for your 370Z to constitute needing a tune. If your Z is under warranty and you do tune and your engine PCM did fail you will end up replacing it on your own dime. I would wait to get tuned if you decide to.
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