Exhaust Muffler Replacement 5.3L LS4

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

1. Remove the catalytic converter. Refer to Catalytic Converter Replacement .
2. Support the exhaust system.
3. With the aid of an assistant, remove the exhaust system from the exhaust hangers.
4. Clean the catalytic converter and the muffler mating surfaces.

1. With the aid of an assistant, install the muffler to the exhaust hangers.
2. Remove the support from the exhaust system.
3. Install the catalytic converter. Refer to Catalytic Converter Replacement .

Exhaust Muffler Replacement 3.8L L26

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

Caution: Refer to Catalytic Converter Movement Caution in the Preface section.

2. Support the exhaust system.



3. Remove the catalytic converter bolts.
4. Remove the catalytic converter gasket.



5. Remove the exhaust hanger insulators from the muffler.
6. Remove the muffler from the support.

1. Install the muffler to the support.
2. Install the exhaust hanger insulators to the muffler.



3. Install the catalytic converter gasket.

Caution: Refer to Fastener Caution in the Preface section.

4. Install the catalytic converter bolts.

Tighten
Tighten the bolts to 45 N·m (33 lb ft).

5. Remove the support from the exhaust system.
6. Inspect the exhaust system for leaks and underbody contact.
7. Lower the vehicle.