uhh dude that is a DIY autotune built MS1 basic.
The only MS built just for the miata is the PNP wich is made for newbs who do not trust there soldering skills or there wiriring expertise.
The PNP costs a few hundred dollars more but
It plugs in nice and easy
has a nicer packaging for the unit itself i think.
Has a better chance of being 1000% right for your car.
has alot less stuff for you to mess up.
Before you blindly give your money for something you know nothing about i suggest you do abit of reading on exactly what MS is and how it is used by us and the rest of the tuner world to make cheap reliable hp. This might take several hours, but it is better than Chad, Braineack, or i Regurgitating all the info for the 1 millionth time. /once you are familiar with the concept and the unit itself then post here with specific questions and we will be able to help you alot more.