Thank you for looking at the Powerchips fuel management computer for a 01-05 miata.  This unit came of a BRP supercharger kit and is very similar to a voodoo box controller.  It has been pre-programmed and it will include installation instructions and wiring details.  It is in working condition but please do all your research on compatibility with the year of your miata and if it is going to work for you.  I went to a stand alone EMS and no longer have any need for this.  If you are looking at add boost to your miata this is the best way next to going with Megasquirt or an FM product.  These little units hardly ever pop up and are rare to find now.  Please email me if you have any questions.