My car doesn't have a CAT. When I bought it, a previous owner had already replaced the entire pipe. I have no idea how old the O2 sensor was or what it's been through, for all I know the original motor might've had a turbo on it that died, or was running a street tune. This car really was a mess, I'm putting it back together one piece at a time.
I think the car is running right now, but we'll see.
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