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I need to replace the rear O2 sensor on my 05 Saabaru. Do I need to get a stock one or one that matches stock or any off the shelf sensor and save some money? I have an AP so not worried about throwing a CEL. My buddy told me the rear O2 sensors aren't that important and save the money and just...

My rear downpipe section with the Cat and O2 sensor is rusted out and failing inspection. I have a bosal shorty dp currently. Looking to replace the rear dp section with something that will mate up with the stock donut gasket and that has a cat or hi-flow cat so i can pass inspections. Would...