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Effectiveness of High-Flow Catalysts

Effectiveness of High-Flow Catalysts

Effectiveness of High-Flow Catalysts

(OP)
Anyone have any direct experience with using high-flow cats, especially on imports?  

I read the following statement online, and it didn't ring true, so I thought I'd solicit some comments:

"If you buy a 'High-flow Cat' from OBX, and other such companies, it is usually just a short 'cherry bomb' with collectors on it. This will not help you in anyway if you have a OBD-II system. Even if you put the O2 sensors before, and after, you WILL get a check engine light, and you car will run in 'safety mode', which will not help the performance at all!"

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