Installation Procedure

Fig 1: Catalytic Converter

Courtesy of GENERAL MOTORS CORP.

Install the muffler and new gasket to the catalytic converter.
NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
Install the muffler to the catalytic converter flange nuts.

Fig 2: Muffler To Catalytic Converter Flange Nuts
Courtesy of GENERAL MOTORS CORP.

Tighten

Tighten the muffler to the catalytic converter flange nuts to 35 N.m (26 lb ft).
Install the catalytic converter to the exhaust manifold pipe flange nuts.

Fig 3: Catalytic Converter To Exhaust Manifold Pipe Flange Nuts
Courtesy of GENERAL MOTORS CORP.

Tighten

Tighten the catalytic converter to the exhaust manifold pipe flange nuts to 35 N.m (26 lb ft).
Connect the heated oxygen sensor (HO2S) electrical connection.

Fig 4: Heated Oxygen Sensor (HO2S) Electrical Connection

Courtesy of GENERAL MOTORS CORP.