bad cats nissan 300zx NA 2+2

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Hey guysi need your brains once again -- my 90 na z 2+2 zx has had hesitation problems most of the year - bad o2's - fixed bad o2's again -- the question i have concerns the cats -- i read somewhere that bad o2 sensors can destroy your cats & clog them ?? is this true ?? i am replacing them with test pipes next week -- but i still seems like the power is down comparing it to my previous 90 NA z ??