Difficulty is subjective and depends on a number of factors, from your mechanical experience and availability of tools and equipment to what kind of condition the exhaust is in, i.e. the amount of rust on the system, if any. For a mechanic working on a lift with air tools, etc., it's not too bad of a job providing there isn't a lot of bolt breaking in the process. It's all unbolt, replace parts and gaskets (and maybe some hardware) and re-assemble. If bolts break that attache the upstream converter to the exhaust manifold, if the job is being done on the ground with the vehicle on jack stands and/or if one isn't that familiar with exhaust work, then the job can get a lot more difficult. Usually in a system with front and rear converters, the only reason to replace the rear converter is if it is rusted through or the inner substrate breaks and is rattling...or, if a bad head gasket failure has dumped a lot of coolant into the exhaust system. In most cases, the upstream converter acts like a sort of filter, for lack of a better term, to the rear converter. The rear converter is also not monitored by the front and rear oxygen sensors in this vehicle, so it is not subject to causing an efficiency code to trigger if the converter becomes such.
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