where are they? how do i know if they're on my car, and how do i take them off? why are they on in the first place?

 

They're in your front suspension. If they're there, just jack up the car and remove. They're there for shipping purposes. Even though the car isn't any lower than regular Z's (or if it is, not by much), it has a longer nose that can be damaged when loading/unloading it on to a truck for delivery.

 

They are black plastic things in the springs.

You need to put the car up on a jack/lift to really see them. They are in between the red coils.

They are very obvious when you lift the car up and you will be able to see them. To take them off

1) lift the car. If you bring it to the dealer they will put it on a lift

2) once on the lift the springs will loosen, and you can pull the spacers right out.

They are put in to avoid spring damage when the car is being shipped.

I belive there were 5 or 6 on my car.

 

Is the nismo Z or suspension any lower than a stock Z? What about it vs an S-tune suspension? Any differences? I'm interested in buying a used Nismo suspension off someone, but want to learn about it first.