That's kind of a loaded question, and here's why:
1) It depends on your states emissions laws, and how they inspect. I'm not familiar with AZ, but in CA any emissions equipment that is removed or not approved by the state (CARB) will cause the vehicle to fail emissions during the "visual" inspection, despite the fact that the actual tailpipe emissions are within spec. However, with any OBDII vehicle, the inspection in CA consists only of a visual inspection and hooking up a scanner to the car's OBDII port to see if it's throwing any codes (check engine light, etc.) As long as the car isn't throwing any codes and the emissions equipment is stock or CARB approved, the car passes. If not, it fails. As such, I would recommend researching how emissions inspections are done in your area, and plan accordingly.
2) I doubt Brian (or any vendor) will outright say that their product will pass emissions, for liability reasons, unless that part is approved by some regulator (again, CARB for CA, don't know about AZ).
Hope this helps.
2006 MX-5, marble white with black OEM hardtop: Flyin' Miata Stage 2 suspension, Flyin' Miata exhaust, GWR Helmholtz mid-pipe, Hard Dog M3 roll bar, Hawk HP+ pads, stainless steel lines, Hankook RS3 215/45/17, Voodoo shift knob.