Catalytic Converter

Thanks to OM Rickie ".Area A includes townships in Maricopa, Yavapai, and Pinal counties; "
According to this ,this is where you live (Area "A")...


ll other vehicles in Area A, except diesel vehicles, must pass a steady state loaded test and a curb idle emissions test.Repair and maintenance costs not to exceed $500 in Area A and $300 in Area B.OBD is utilized as part of the state emissions inspection process.Visit the Arizona Department of Environmental Quality for more information on Arizona’s Vehicle Emissions Inspection Program.
In plain English,looks like the equivalent of a "California's IM240 " dyno loaded smog test program, to me. Here(California), that requires an OEM parts needed to pass "visual inspection". If the necessary OEM equipment isn't there ,fail the test. (How it works in CA)


Here is the information for your answer,I would think.(I hate this stuff...)
Visit the Arizona Department of Environmental Quality for more information on Arizona’s Vehicle Emissions Inspection Program. Better to learn up front,before modifications & spent money. Hopefully someone who know Arizona chimes in ,with help.
To me,is that oem emissions equipment inspecton necessary on smog tests needed in your county? Check that link,or a good smog tech.