Installation Procedure

IMPORTANT: Use care not to over extend the heated oxygen sensor pigtail.

Lower the exhaust system only enough to install the catalytic converter to the resonator inlet pipe (1).
IMPORTANT: Ensure the solid portion of the catalytic converter heat shield is upward.

Fig 1: Installing Catalytic Converter To Resonator Inlet Pipe
Courtesy of GENERAL MOTORS CORP.
Slide two service clamps (2) over the catalytic converter outlet pipe (3).
Do not tighten at this time.

Slide the catalytic converter outlet pipe (3) over the resonator inlet pipe (1), until fully seated against the heated oxygen sensor boss.

NOTE: Refer to EXHAUST SYSTEM INSPECTION NOTICE in Cautions and Notices.
Place a NEW catalytic converter gasket over the catalytic converter studs.
NOTE: Refer to FLEX DECOUPLER NOTICE in Cautions and Notices.
Raise the exhaust system into position, aligning the catalytic converter with the exhaust manifold pipe.
Install the nuts securing the catalytic converter to the exhaust manifold pipe.
Do not tighten at this time.

Fig 2: Installing Nuts Securing Catalytic Converter To Exhaust Manifold Pipe
Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
Install the 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).

Fig 3: Installing Bolts Securing Center Exhaust Hangers To Rear Suspension Support Brackets
Courtesy of GENERAL MOTORS CORP.
Tighten the catalytic converter nuts.
Tighten

Tighten the catalytic converter nuts in a crisscross pattern to 25 N.m (18 lb ft).
Remove the jack from under the vehicle.
IMPORTANT: Ensure the catalytic converter outlet pipe is fully seated against the heated oxygen sensor boss.
Position the service clamps midway on the catalytic converter outlet pipe, as close together as possible.
Rotate the clamps so the fastening ends are pointing in opposite directions.
Tighten

Tighten the service clamps to 30 N.m (22 lb ft).
Lower the vehicle.
Check the exhaust system for leaks.