GM Service Manual Online
For 1990-2009 cars only

Intermediate Pipe LD9

Removal Procedure

    Imporatant: A service muffler will be needed when replacing the intermediate pipe on an originally equipped welded system.

  1. Raise the vehicle. Refer to General Vehicle Lifting and Jacking in General Information.
  2. Support the three way catalytic converter.

  3. Object Number: 25822  Size: SH
  4. Cut the intermediate pipe at the muffler.

  5. Object Number: 25271  Size: SH
  6. Remove the intermediate pipe from the three way catalytic converter.

  7. Object Number: 25293  Size: SH
  8. Remove the intermediate pipe from the hangers.
  9. Remove the intermediate pipe.

  10. Object Number: 107963  Size: SH
  11. Remove the muffler from the hangers.

  12. Object Number: 25271  Size: SH
  13. Remove the three way catalytic converter seal.
  14. Clean the flange surface.

Installation Procedure


    Object Number: 25271  Size: SH
  1. Install the three way catalytic converter seal.

  2. Object Number: 25293  Size: SH
  3. Install the intermediate pipe to the hangers.

  4. Object Number: 25271  Size: SH
  5. Install the intermediate pipe to the three way catalytic converter.

  6. Object Number: 107963  Size: SH
  7. Install the muffler to the hanger.

  8. Object Number: 25822  Size: SH
  9. Weld the muffler to the intermediate pipe.
  10. Lower the vehicle.

Intermediate Pipe L89

Removal Procedure

    Important: A service muffler will be needed when replacing the intermediate pipe on an originally equipped, welded system.

  1. Raise the vehicle. Refer to General Vehicle Lifting and Jacking in General Information.
  2. Support the three way catalytic converter.

  3. Object Number: 25822  Size: SH
  4. Cut the intermediate pipe at the muffler.

  5. Object Number: 25271  Size: SH
  6. For the 3.1L engine with a single exhaust, remove the intermediate pipe from the three way catalytic converter.

  7. Object Number: 25505  Size: SH
  8. For the 3.1L engine with a dual exhaust, remove the intermediate pipe from the three way catalytic converter.

  9. Object Number: 25293  Size: SH
  10. Remove the intermediate pipe from the hanger.
  11. Remove the intermediate pipe.

  12. Object Number: 107963  Size: SH
  13. Remove the muffler from the hangers.

  14. Object Number: 25271  Size: SH
  15. For the 3.1L engine with a single exhaust, remove the three way catalytic converter seal.

  16. Object Number: 25505  Size: SH
  17. For the 3.1L engine with a dual exhaust, remove the three way catalytic converter seal.
  18. Clean the flange surface.

Installation Procedure


    Object Number: 25271  Size: SH
  1. For the 3.1L engine with a single exhaust, install the three way catalytic converter seal.

  2. Object Number: 25505  Size: SH
  3. For the 3.1L engine with a dual exhaust, install the three way catalytic converter seal.

  4. Object Number: 25293  Size: SH
  5. Install the intermediate pipe to the hanger.

  6. Object Number: 25271  Size: SH
  7. For the 3.1L engine with a single exhaust, install the intermediate pipe to the three way catalytic converter.

  8. Object Number: 25505  Size: SH
  9. For the 3.1L engine with a dual exhaust, install the intermediate pipe to the three way catalytic converter.

  10. Object Number: 107963  Size: SH
  11. Install the muffler to the hangers.

  12. Object Number: 25822  Size: SH
  13. Weld the muffler to the intermediate pipe.
  14. Lower the vehicle.