Dark thing between the tail pipes?
 

What is the dark thing on the back between the tail pipes?

This is the location for the rear fog light which is required in many locations in the world (Japan, Europe, Canada, etc) designed to alert drivers approaching a car from the rear in foggy/low visibility conditions.

As far as I know, rear fog lights such as this are not "illegal" in the U.S. but apparently, the requirements for the U.S. Vs other countries are not compatable with the location/height, etc of the light on the Z; so, Nissan just puts a dummy/non-functional assembly in the spot (rather than completely re-design the rear bumper cover which, of course, adds a good deal of cost).

There are several threads on this that you might want to check including this one...

http://www.the370z.com/exterior-inte...r-blinker.html

I recently completed the work required to make my rear fog functional but there are many possibilities for this using this area.

Robert,
Thank you for an informative response.

What did u do to make the rear fog functional any pics I would like to do something with mine

Cleaned it up a little for you. Welcome to the site :tiphat:

There are pics in the thread I referenced above.