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If you damage your cat, the shop would usually replace it with OEM equipment, as that's what federal regs call for.
If its an aftermarket piece, you're on your own, they won't touch it.
There's no real functional difference between primary and secondary. Primary is monitored by the ECU, secondary is just a redundant backup. Technically, both are required by federal regulations to remain OEM and intact for the life of the warranty which is 8 years or 80k miles as they are part of the emissions control system.
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