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I have a 2002 svt focus with borla catback. Just today it threw the code P0420 which I know has something to do with the catalytic converter or o2 sensors. What I am wondering is I would like to delete the cat and get a test pipe because the way it is set up now isn't loud enough. If I get a test pipe and get an 02 spacer will it still throw a code? I'd really just like to get rid of the cat. Thanks.