Ok here are your typical catalytic converter on a N63 or N63tu,,,,customer said check engine light came on,,,,we found rich mixture faults and bank 1 catalytic converter low efficiency ,,,,performed a catalytic converter test,,,but that didn’t help,,,so welcome to modern technology,,,,I took a bore scope and removed the down pipe and found the catalytic converter damaged. So this job is not that bad,,,you have to remove the heat shields and vacuum pump to gain enough room to remove the catalytic converter,,,,if you are replacing bank 1 catalytic converter you don’t have to remove bank 2 catalytic converter,,,,,but if you need to replace bank 2 catalytic converter then you have to remove bank1 catalytic converter first to gain access,,,,so I got lucky just bank1 catalytic converter is coming out. Here the whole catalytic converter removed with part of the down pipe,,,,which snakes behind the engine to the exhaust pipe.
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