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    2006 GMC Truck Sierra 1500HD 4WD 6.0L SFI 8cyl

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    See Details

    Muffler/Resonator

    Inspect/Replace

    • Any inspection should include listening for hissing or rumbling that would result from a leak in the system. A stethoscope can be used. Remove the metal end from the stethoscope and use just the hose to listen.
    • An on-lift visual inspection should pinpoint any of the following types of damage:
      • Holes, road damage, separated connections, and bulging muffler seams.
      • Kinks and dents.
      • Discoloration, rust, soft corroded metal, and so forth. Mufflers often rust out on the lowest end.
      • Torn, broken, or missing hangers and clamp.

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