are these parts warranty friendly? Will any of them void the nissan warranty?

S-tune will not void your warranty, this includes things like exhaust, shift knob, decals, etc

R-tune will void your warranty, this includes things like cai, header, cams, suspension, basically anything you would want to do

technicly, we are talking TECHNICLY, under some act (i dont know the name) nothing you put on your car will void the warenty unless they can directly relate it to the problem. I have my car lowered and i have a set of aftermarket wheels on it and i had a brake problem with my car. i took it to the dealer and they didnt say anything about it. they put new rotors on my car and called it a day.

but that is technicly. most dealers will shoot you down and throw a noose in the tree and hang themselves before they will warenty something once the car has been altered in any way.

we had a customer that we lowered her car and she went to the dealer to get it allighned and they wouldnt touch it.
so i depends on where you go, but most of the time the dealer will bitch about it.