mufflers are not a part of smog regulations i dont think...it has nothing to do with your emission system...
Again, you should have 0 issue passing smog with the mid muffler since you are still running a muffler, just not in the back...if you were to fail smog for any reasson, my money would be on it having to do with engine problems, your cats being bad, or some visual failure...not sure if they do that in AZ, but they do in california
2007 V6 TORCH RED
(will be missed)
2001 Bullitt - #1001 (Good riddance)
2004 Mach 1
--Magnaflow Exhaust, MGW shifter..For now