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I'd recommend that people just buy a catless downpipe instead of doing this. I feel like if you ever want to put the car back to stock, and since most people live in areas where they do indeed have to do emissions tests, you're going to pay more to buy a working catalytic converter. You can probably find a clean used catless downpipe for $150 or so. And they're specifically designed to run catless. That might not matter all that much, but it could make a slight difference.
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