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People with Cat Back Systems on their trucks

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by mrbrown88, Jul 18, 2011.

  1. mrbrown88

    mrbrown88 New Member

    I have a 2011 with the 5.3. I just ordered a MBRP cat back system. Whenever you guys put on your system did you throw a check engine light? If so can they turn that off no problem?
  2. adampaul1964

    adampaul1964 Active Member ROTM Winner 1000 Posts

    '05 5.3 with Gibson cat back, no CEL when I did mine.
  3. ajarman

    ajarman New Member ROTM Winner 1000 Posts

    '05 5.3 Gibson cat back no CEL '07 classic 5.3 Volant cat back no CEL. '05 GTO 6.0 cat back no CEL and buddy put Gibson cat back on '10 5.3 no CEL
  4. Als09Sierra

    Als09Sierra Active Member ROTM Winner 1000 Posts

    '09 with Borla Cat Back. Did you disconnect any sensors on or near the cats when you installed?
  5. adampaul1964

    adampaul1964 Active Member ROTM Winner 1000 Posts

    Don't think he has it yet, I think he's just asking if it will set a CEL. To the OP, you should have no problems with your install because it is exactly what is says, a "cat back", no sensors will be affected since there aren't any after the cat.
  6. BigBlueLB756

    BigBlueLB756 Member

    '09 with a Dynomax cat-back system. No CEL at all; I did disconnect my battery neg. while I changed out the systems, though.
  7. Metaluzc

    Metaluzc New Member

    As the others have said, the CEL shouldn't come on unless you do something to the O2 sensors and if it does throw the code, you could always get a DSP or DST and get ride of the code.
  8. silveradotrailblazer

    silveradotrailblazer New Member ROTM Winner 1000 Posts

    I've had cat-backs on everything we've owned and never got a CEL. If you do just go to a parts store like AutoZone and they will clear the code. MBRP makes a great system.

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