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Hello, my car is throwing code P0420. I believe either the Cat is bad or the cat could be gutted. If I put an OBX header on, can I put a High flow cat to it and then put a cat back exhaust on without any welding? I am looking to put a hi flow cat on just because I rather be legal. Is there an aftermarket header that a hi flow cat will bolt up too? Also what are some of the best hi flow cats for a 2003 ZX3?
 

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Hmmm...could be a bad cat or something else. But to answer your question, yes you shouldn't have to weld anything if you were to get a full new exhaust. You will also pick up some decent HP as well.
 
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