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  1. #1
    Sr. Apprentice
    Join Date
    Mar 2011
    Waterloo, IL

    Question People with Cat Back Systems on their trucks

    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. #2


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

  3. #3


    '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

    ________2013 4C Rated__________

  4. #4


    '09 with Borla Cat Back. Did you disconnect any sensors on or near the cats when you installed?
    2009 GMC Sierra 5.3L running on E85
    Black and chrome
    Volant CAI
    Borla dual exhaust
    Chrome Billet grill
    Tonneau cover
    4300k High/Low Beam HIDs
    Westin Ultimate Bull Bar with PIAA 540s
    Blacked-out tail and third brake light

  5. #5


    Quote Originally Posted by Als09Sierra View Post
    '09 with Borla Cat Back. Did you disconnect any sensors on or near the cats when you installed?
    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. #6


    '09 with a Dynomax cat-back system. No CEL at all; I did disconnect my battery neg. while I changed out the systems, though.
    The Cheap-*ss Modder & Thread Killer
    The Realist says, "The glass is too big".

    2013 GMC Sierra 1500 SLT Z60 4WD Crew Cab
    Mineral Green Metallic w/ Tan Leather Interior
    5.3 L FLEX w/AFM, 6A, Cheap-*ss Mods
    32 Dump Club Member
    Range V8 AFM Eliminator

  7. #7


    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.
    2003 Silverado 2500HD 6.0L Vortec V8
    2" Body Lift
    3" Suspension Lift
    Skyjacker Hydro 7000 Shocks
    Skyjacker Steering Stabilizer
    35" Tires with 20" American Racing Rims
    Velocity Cold Air Intake
    Billet Throttle Body Spacer
    BBK Performance Headers
    MBRP Cat-Back Exhaust System
    DiabloSport Predator- Soon to be tuned by Diablew

    "Soon to be leveling-kit"

  8. #8


    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.

    2005 Chevy Silverado Z71 Crew Cab
    6" Skyjacker lift w/Edlebrock dual front remote resoviour shocks, single rear remote. Rancho skid-plate.
    17" x 9" M/T Classic Lock Wheels, 35" BFG A/T or M/T tires
    4.10 PercisionGears w/factory locker, T/A Performance rear-end cover
    Banks CAI intake, ported throttlebody, JBA coated headers, over-sized Magnaflow cats, Magnaflow cat back exhaust, Diablo tuned
    B&M aluminum deep transmission pan
    Warn brush guard w/Warn 9.5 XP winch, PIAA bulbs, Line-X bedliner, AWS Black tool chest, Extang tonneau cover
    Weather Tech floor mats
    Cover-Craft seat covers
    Dash mat cover
    Formula One window tint
    One black Lab in rear seat.

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