Installation Procedure

Fig 1: View Of Rear Exhaust Hangers & Nuts

Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to Fastener Notice in Cautions and Notices.

Install the 2 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 2: View Of Exhaust Pipe To Catalytic Converter

Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to Exhaust System Inspection Notice in Cautions and Notices.

NOTE: Refer to Flex Decoupler Notice in Cautions and Notices.

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 4 nuts to the catalytic converter studs.

Fig 3: View Of Rear Exhaust Hanger Brackets & Bolts

Courtesy of GENERAL MOTORS CORP.

Install the 2 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 4: View Of Center Exhaust Hangers & Bolts

Courtesy of GENERAL MOTORS CORP.

Install the 2 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 4 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 (HO2S) Replacement Bank 1 Sensor 2 in Engine Controls-4.6L.
Remove the oxygen sensor wiring harness heat shield. Refer to Oxygen Sensor Wiring Harness Heat Shield Replacement .
Lower the vehicle.