i was told it was good. the reason i r&red the cat was because there was no temp. change between the exhaust flowing in and what was flowing out. that told me it was doing nothing. now with the new one there is a change. also, the o2 sensor light has never come on, what does it do? i dont want to sound like i am throwing your advice out the window. does anyone else have an idea? i will check the o2 sensor again

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