 Catalytic Converter question
I have a 1999 318ti. My car's currently throwing CEL's for both the O2 sensors (upstream and downstream) and the Catalytic Converter. Since upstream O2 sensor failure can result in damage to the Cat, I'm going to assume that needs replacing alongside the O2 sensors, which are junked. 318ti's are rare here, and a new catalytic converter is expensive, so I was wondering - if I find a 318i at a junkyard, can I take the cat off that and put it on my car, since the engines are the same and so is most of the physical components? | 
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