Installation Procedure

With a single muffler system.
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.

Fig 1: Installing Rear Exhaust Hanger Bracket
Courtesy of GENERAL MOTORS CORP.

Tighten

Tighten the rear exhaust hanger nut to 30 N.m (22 lb.ft).
With a dual muffler system.
Install the rear exhaust hanger brackets to the rear exhaust hangers.

Fig 2: Installing Rear Exhaust Hanger Brackets
Courtesy of GENERAL MOTORS CORP.
Install the 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).

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 3: Installing Catalytic Converter Into Exhaust Manifold Pipe
Courtesy of GENERAL MOTORS CORP.
With a single muffler system.
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 4: Installing Bolt Securing Rear Exhaust Hanger Bracket
Courtesy of GENERAL MOTORS CORP.
With a dual muffler system.
Install the bolts securing the rear exhaust hanger brackets to the rear compartment rails.

Fig 5: Installing Bolts Securing Rear Exhaust Hanger Brackets To Rear Compartment Rails
Courtesy of GENERAL MOTORS CORP.

Tighten

Tighten the rear exhaust hanger bolts to 50 N.m (37 lb.ft).
Install the two bolts securing the center exhaust hangers to the rear suspension support brackets.

Fig 6: Installing Two Bolts Securing Center Exhaust Hangers
Courtesy of GENERAL MOTORS CORP.

Tighten

Tighten the center exhaust hanger bolts to 30 N.m (22 lb.ft).
Tighten the four catalytic converter nuts previously installed in step 7.
Tighten

Tighten the catalytic converter nuts to 25 N.m (18 lb.ft).
Install the heated oxygen sensor. Refer to INSTALLATION .
Install the oxygen sensor wiring harness heat shield. Refer to OXYGEN SENSOR WIRING HARNESS HEAT SHIELD REPLACEMENT .
Lower the vehicle.