Installation Procedure

Install the rear exhaust hanger brackets to the rear exhaust hangers.
NOTE: Refer to FASTENER NOTICE .
Install the two nuts securing the rear exhaust hangers to the rear exhaust hanger brackets.
Tighten

Tighten the rear exhaust hanger nuts to 30 N.m (22 lb ft).

Fig 1: Rear Exhaust Hanger, Brackets & Nuts
Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to EXHAUST SYSTEM INSPECTION NOTICE .
Place a NEW catalytic converter gasket over the catalytic converter studs.
NOTE: Refer to FLEX DECOUPLER NOTICE .
With the aid of an assistant, raise the exhaust system into position, aligning the catalytic converter with the rear exhaust manifold pipe.
Finger tighten the four nuts to the catalytic converter studs.

Fig 2: Catalytic Converter & Studs
Courtesy of GENERAL MOTORS CORP.
Install the two bolts securing the rear exhaust hanger brackets to the rear compartment rails.
Tighten

Tighten the rear exhaust hanger bolts to 50 N.m (37 lb ft).

Fig 3: Rear Exhaust Hanger & Bolts
Courtesy of GENERAL MOTORS CORP.
Install the two bolts securing the center exhaust hangers to the rear suspension support brackets.
Tighten

Tighten the center exhaust hanger bolts to 30 N.m (22 lb ft).
Tighten the four catalytic converter nuts previously installed in step 5.
Tighten

Tighten the catalytic converter nuts to 25 N.m (18 lb ft).
Install the heated oxygen sensor. Refer to HEATED OXYGEN SENSOR .
Remove the oxygen sensor wiring harness heat shield. Refer to Oxygen Sensor Wiring Harness Heat Shield Replacement
Lower the vehicle.

Fig 4: Center Exhaust Hanger & Bolts
Courtesy of GENERAL MOTORS CORP.