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Message: <blockquote data-quote="d_punch" data-source="post: 320543" data-attributes="member: 8547">I would check the welds were there cut the old cats out, to make sure that it has sealed the mip-pipe correctly.Also check the O2 sensor, first make sure that they are there, then check the connections and wiring. Like make sure that the harness is in all the way, and in correctly, check for any damaged wires. Any cuts or melted wires will mess things ups.If after that all looks well, i would suggest on changing your O2 sensors, as they could be the problem once they go bad.And if money permits you could just go with an off road mid pipe ( with no cats) as most people do, i do anyway.Good luck</blockquote>