Installation Procedure

Important:  When installing a new exhaust system component, always use new gaskets and seals.

1. Position the front pipe with new exhaust manifold gaskets.
2. Install the 6 front pipe nuts (1) to the exhaust manifolds (2). Do not fully tighten the nuts.
   Fig 1: Installing Front Pipe To Exhaust Manifold (2.5L)

   Courtesy of GENERAL MOTORS CORP.
3. Install the 2 bolts (1) to the front pipe assembly (2). Do not fully tighten the bolts.
Fig 2: Installing Front Pipe Assembly Bolts (2.5L)
Courtesy of GENERAL MOTORS CORP.
4. Install the propeller shaft. Refer to PROPELLER SHAFT REPLACEMENT-FRONT .
5. Align all system components before tightening the fasteners, in order to prevent noise or vibrations.
   NOTE: Refer to FASTENER NOTICE .
6. Tighten the front pipe assembly bolts.

   Tighten 

   Tighten the front pipe assembly bolts to 50 N.m (37 lb ft).

7. Tighten the front pipe assembly nuts.

   Tighten 

   Tighten the front pipe assembly nuts to 50 N.m (37 lb ft).

8. Lower the vehicle.
9. Connect the Heated Oxygen Sensor (HO2S1) electrical connectors and attach the couplers to the coupler mounting bracket.