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Interesting video, never seen a cat tested like that, but it makes sense. My flex pipe is just starting to come apart, so it could be from the extra back pressure or it could be causing my error code.
My car is EFI, DOHC, and nearly 260k miles on the original cat/o2 sensors, I'm sure something is starting to go after a life of no repairs (I had to spend $500+ fixing it myself when I first bought it).
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