Catylitic converters typically last for the life of the car unless there's a problem with the engine causing them to fail early. Failing emissions could also be engine management related and have nothing to do with the cat-cons.
Rainydave is right about the extended warrenty on the exhaust and emissions system. Federally mandated for 8 years / 80,000 miles. I'd call Mazda first before cutting a check to the local mechanic.
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