Installation Procedure

Insert a NEW seal into the seal grove of the catalytic converter.
NOTE: Refer to EXHAUST SYSTEM INSPECTION NOTICE in Cautions and Notices.
Position the catalytic converter to the exhaust manifold and catalytic converter hanger bracket.
NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
Install the 3 nuts attaching the catalytic converter to the exhaust manifold.
Tighten

Tighten the exhaust manifold pipe nuts to 22 N.m (16 lb ft).

Fig 1: Installing Catalytic Converter To Exhaust Manifold
Courtesy of GENERAL MOTORS CORP.
Install the 2 nuts attaching the catalytic converter to the catalytic converter hanger bracket.
Tighten

Tighten the catalytic converter hanger bracket nuts to 25 N.m (18 lb ft).
Place a NEW seal on the left side catalytic converter flange.
Place a NEW gasket over the right side catalytic converter studs.
Align the exhaust pipe flanges with the studs located in the rear of the catalytic converters.
Install the 2 nuts securing the exhaust pipe to the left catalytic converter.
Tighten

Tighten the catalytic converter nuts to 15 N.m (11 lb ft).

Fig 2: Installing Exhaust Pipe To Left Catalytic Converter
Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to FLEX DECOUPLER NOTICE in Cautions and Notices.
Install the 2 nuts securing the exhaust pipe to the right catalytic converter.
Tighten

Tighten the catalytic converter nuts to 15 N.m (11 lb ft).

Fig 3: Installing Exhaust Pipe To Right Catalytic Converter
Courtesy of GENERAL MOTORS CORP.
Install the heated oxygen sensor if previously removed. Refer to HEATED OXYGEN SENSOR in Removal & Installation.
Connect the heated oxygen sensor at the sensor pigtail.

Fig 4: Installing Heated Oxygen Sensor Pigtail
Courtesy of GENERAL MOTORS CORP.
Lower the vehicle.