3 cats on 12' sierra???

Discussion in 'General Chevy & GM Tech Questions' started by justaphase44, Feb 18, 2013.

  1. justaphase44

    justaphase44 Rockstar

    Changing oil last night and noticed what looks to be like a 3rd cat. It's after the y pipe but before the muffler. Can anyone verify this for me? Thanks guys

    Last edited: Feb 18, 2013
  2. Sierraowner5.3

    Sierraowner5.3 Rockstar 4 Years 1000 Posts

    resonator i think.....

  3. justaphase44

    justaphase44 Rockstar

    Yeah, went by muffler shop and guy said he had a 11' but his didn't have it on there. Don't know what gm has up their sleeve lol

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