I build custom intercoolers for many cars. I have some high end coatings and materials that I use. You can choose a lot of different options.
This is one of my favorite colors. This is just a sample for color choice. The miata is a slightly smaller core but can be ordered in the same color.
This is an example of a fully custom type of elbow and intercooler pipe. I have a lot of styles I could add to this site. I just did not want to add a 100 pictures I felt this makes the point.
If you want me to add a BOV to your system I can. I have a set up that can me added inline. Or I can custom weld you a housing directly onto the intercooler. I can also move this housing to a location hidden within the pipe work. The cost for this would vary. I think it is safe to add a cost of $40-$80 depending on what type of setup you want. Again that's if you need this. I can also add a BOV to the turbo charged version of my intercooler system. Right at the upper charge pipe.
The intercooler system comes ready to install on any applications you may have. I designed this system to be modular. The upper section of the pipe near the supercharger can be swapped out for different versions. For example if you have a jackson racing, track dog, G-19 or FFR supercharger I can change the pipe to adapt right to those superchargers. If you are running a flying miata, goliath or custom turbo I can adapt to those as well.