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I just took my old cat cut it open, cleaned it out, then put 2.5 inch pipe in there, welded it all back together. So when I get my inspection it looks like a cat in the exhaust. In ohio we have a loop hole in testing. If you fail just take it to a mechanic, and test again. If you fail again after spending more than $250.oo you get an exemption. Well lucky enough my friend is a certified tech
 
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