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Denali_6point2

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  1. Denali_6point2
    Yeah still do and the third cat as well.
  2. Denali_6point2
    They cut pretty close to the o2 sensors and i took it back today to check for any leaks which i didnt hear and neither did they. They re welded around it and i cleared the code and it came back up so im thinking o2 sensor mightve gone out.
  3. Denali_6point2
    Ok so I got my exhaust done today did a 3in piping from the cats back with an x-pipeand two Borla XR1's and had the third cat removed. Drove the truck about 3-5 miles back to my house and my check engine light came on. I hooked up my scanner and it shows DTC code P0420-Catalyst System Efficiency below Threshold(bank 1). Ive read that the third cat really is more of a dummy cat but im not sure if this is why my light came on. Anyone experience this before or have some info on it?
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