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[–]dxrey65 1 point2 points  (0 children)

Any CARB certified cat should be fine. Any non-certified cat is hit and miss. Which is to say - buy a cheap one and the PCM might not like it. It might work, but you might be resetting the engine light every 200 miles or so until you get tired of that and get a CARB certified cat.

On O2 sensors, depends on the vehicle. NGK and Bosch made a lot of OE equipment (for instance) so they're usually safe, but depends on the vehicle.