I finally got around to doing some more research on emission tests and found a couple of Chicago-area Mustang forums. Everyone says that you'll pass as long as you have the car custom-tuned to disable the various systems. One guy had EGR, O2, AIR, and even EVAP all saying "not supported" on his emission report and he passed just fine lol.
Now to figure out what to eliminate... EGR and AIR must go for sure.
