Installation Procedure

When installing exhaust components, inspect the exhaust system for proper alignment. Misaligned components commonly cause rattles, noise and vibrations in the exhaust system. During system alignment, leave all of the bolts or nuts loose, until all of the parts are properly aligned. After properly aligning the parts, tighten the bolts or nuts from the front to the rear.

In order to maintain the alignment of the exhaust system, replace any damaged exhaust system hangers, hanger brackets, and clamps.

Important: 

• Replacement of exhaust system parts must be OEM standard to ensure that the vehicle operates as designed.
• Replace the tailpipe when replacing the muffler.
• Always use new nuts when installing the exhaust pipe to the exhaust manifold.
• Before installing the new nuts, clean the exhaust manifold stud threads with a wire brush.

1. To aid in the installation of the muffler assembly, lubricate the rubber hangers with rubber lubricant GM P/N 12345884.

   Install the muffler assembly into the vehicle.

2. Connect the muffler assembly to the tailpipe hanger.
   Fig 1: Connecting Muffler Assembly To Tailpipe Hanger

   Courtesy of GENERAL MOTORS CORP.
3. Connect the muffler assembly to the rear hanger.
   Fig 2: Connecting Muffler Assembly To Rear Hanger

   Courtesy of GENERAL MOTORS CORP.
4. Connect muffler assembly to the front hanger.
   Fig 3: Connecting Muffler Assembly To Front Hanger

   Courtesy of GENERAL MOTORS CORP.
   NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
5. Install the 3 nuts to connect the muffler assembly to the catalytic converter assembly.

   Tighten 

   Tighten the nuts to 40 N.m (30 lb ft).

   Fig 4: Installing Nuts To Connect Muffler Assembly To Catalytic Converter Assembly

   Courtesy of GENERAL MOTORS CORP.