what you can do is take this to a shop that has a diagnostic computer. with this they can watch the o2 sensors to see if they are fluctuating as they should. the code you are getting is that the catalytic converter is Below Threshold.
this means that the catalytic converter is damaged inside like one of the fins is ether bent from the high heat or one or more fins has broken off. if this is the case this will not slow the exhaust to remove the unburnt gases that is the job of the catalytic converter.
aftermarket parts are cheaper and thus not up to OEM standards. you get what you pay for with aftermarket parts
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Thanks
David
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