GM Service Manual Online
For 1990-2009 cars only

Exhaust Muffler Replacement Dual

Removal Procedure

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.
  2. Notice: To prevent internal damage to the flexible coupling of the catalytic converter assembly, the converter must be supported. The vertical movement at the rear of the catalytic converter assembly must not exceed 6 degrees up or down.

  3. Support the exhaust system.

  4. Object Number: 372950  Size: SH
  5. Remove the exhaust tail pipe.

  6. Object Number: 25822  Size: SH

    Important: The cut must be made as close to the muffler as possible to ensure adequate overlap for clamping.

  7. Cut the exhaust pipe (1) at the exhaust muffler in front of the weld (2).

  8. Object Number: 33047  Size: SH
  9. Remove the exhaust muffler rear hanger insulators from the exhaust muffler.
  10. Remove the exhaust muffler.

Installation Procedure


    Object Number: 33047  Size: SH
  1. Install the exhaust muffler.
  2. Install the exhaust muffler rear hanger insulators to the exhaust muffler.

  3. Object Number: 71715  Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Connect the exhaust muffler to the exhaust pipe with a exhaust muffler inlet pipe clamp.
  5. Tighten
    Tighten the exhaust muffler inlet pipe clamp nuts to 50 N·m (37 lb ft).


    Object Number: 372950  Size: SH
  6. Install and adjust the exhaust tail pipe.
  7. Tighten the tail pipe clamp.
  8. Tighten
    Tighten the tail pipe clamp to 35 N·m (26 lb ft).

  9. Remove the support from the exhaust system.
  10. Inspect the exhaust system for leaks and underbody contact.
  11. Lower the vehicle.

Exhaust Muffler Replacement Single

Removal Procedure

Important: The muffler is serviced as a complete assembly and cannot be serviced separately.

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General information.
  2. Support the exhaust system.
  3. Remove the catalytic converter from the muffler. Refer to Catalytic Converter Replacement .

  4. Object Number: 289492  Size: SH
  5. Remove the exhaust system from the exhaust hangers.
  6. Clean the catalytic converter and the muffler gasket mating surfaces.

Installation Procedure


    Object Number: 289492  Size: SH
  1. Install the muffler to the exhaust hangers.
  2. Support the exhaust system.
  3. Install a new gasket to the catalytic converter and the muffler.
  4. Install the catalytic converter to the muffler. Refer to Catalytic Converter Replacement .
  5. Remove the exhaust system support.
  6. Lower the vehicle.
  7. Inspect for exhaust leaks.