Installation Procedure

Install the rear exhaust hanger bracket to the rear exhaust hanger.
NOTE: Refer to FASTENER NOTICE .
Install the nut securing the rear exhaust hanger to the rear exhaust hanger bracket.
Tighten

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

Fig 1: Installing Rear Exhaust Hanger Bracket To Rear Exhaust Hanger
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 exhaust manifold pipe.
Finger tighten the four nuts to the catalytic converter studs.

Fig 2: Installing Catalytic Converter Gasket
Courtesy of GENERAL MOTORS CORP.
Install the bolt securing the rear exhaust hanger bracket to the rear compartment rail.
Tighten

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

Fig 3: Installing Bolt Securing Rear Exhaust Hanger Bracket To Rear Compartment Rail
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 (HO2S) 2. Refer to HEATED OXYGEN SENSOR .
Install the oxygen sensor wiring harness heat shield. Refer to OXYGEN SENSOR WIRING HARNESS HEAT SHIELD REPLACEMENT .
Lower the vehicle.

Fig 4: Installing Bolts Securing Center Exhaust Hangers To Rear Suspension Support Brackets
Courtesy of GENERAL MOTORS CORP.