GM Service Manual Online
For 1990-2009 cars only

Removal Procedure

Caution: Refer to Exhaust Service Caution in the Preface section.

Caution: Refer to Safety Glasses Caution in the Preface section.

  1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.

  2. Object Number: 1343970  Size: SH
  3. Remove two support hanger retainer clips (1) and two rubber hangers (2) from the support hangers.

  4. Object Number: 1343972  Size: SH
  5. Loosen two ring clamp fastening nuts (1).
  6. Slide both of the rear pipes (2) out of the muffler pipe slip joints.
  7. Remove the rear pipe assembly.
  8. Support the catalytic converter assemblies and the muffler assemblies with a jackstand.

  9. Object Number: 1343069  Size: SH
  10. Remove the catalytic converter to muffler flange bolts (1).
  11. Separate the catalytic converter and muffler assemblies then remove the flange gasket (2), from the flange joint.

  12. Object Number: 1343973  Size: SH
  13. Remove four retainer clips (1), and four rubber hangers (2), from the right and left muffler support hangers.
  14. Remove the muffler assembly.

Installation Procedure

  1. Position the muffler assembly to the vehicle.
  2. Support the muffler assembly with a jackstand.

  3. Object Number: 1343973  Size: SH
  4. Install four rubber hangers (2), to the right and left muffler support hangers and four retainer clips (1).

  5. Object Number: 1343069  Size: SH
  6. Install a new catalytic converter to muffler flange gasket (2).
  7. Notice: Refer to Fastener Notice in the Preface section.

  8. Install the catalytic converter to muffler flange bolts (1).
  9. Tighten
    Tighten the catalytic converter to muffler flange bolts to 45 N·m (33 lb ft).


    Object Number: 1343972  Size: SH
  10. Position the rear pipe assembly.
  11. Slide both of the rear pipes (2) into the muffler pipe slip joints.
  12. Install two ring clamp fastening nuts (1).
  13. Tighten
    Tighten the ring clamp nuts to 43 N·m (32 lb ft).


    Object Number: 1343970  Size: SH
  14. Install two rubber hangers (2), to the support hangers and two support hanger retainer clips (1).
  15. Lower the vehicle.