Caution: Always wear protective goggles and gloves when removing exhaust parts as falling rust and sharp edges from worn exhaust components could result in serious personal injury.

When removing exhaust components, an accumulation of dirt and corrosion can make work difficult. Use a penetrating oil on the threads of the U-bolts in order to assist in the removal of these components.

Notice: Replacement of exhaust system parts must be OEM standard to ensure that the vehicle operates as designed.

Important: 

•	When jacking or lifting the vehicle from the frame side rails, make sure the lift pads do not contact the catalytic converter or damage to the converter will result.

•	When servicing of the exhaust system requires removing and replacing the oxygen sensor, refer to Heated Oxygen Sensor Replacement - Bank 2 or Heated Oxygen Sensor Replacement - Bank 1 .

•	Apply sealer GM P/N 9984226 or equivalent to all slip--joint connections.

•	Replace the tailpipe whenever the muffler is replaced.

•	Always use new nuts when installing the exhaust pipe to the engine manifold. Clean the engine manifold stud threads with a wire brush before installing the new nuts.

1. Rattles and noise vibrations in the exhaust system are usually caused by the misalignment of parts. Check for proper alignment when installing a new exhaust pipe, or muffler and tailpipe.
2. When aligning the system, leave all bolts and nuts loose until all parts are properly aligned.
3. Tighten the nuts and bolts, working from the front to the rear.
4. Replace damaged exhaust system hangers, hanger brackets, and clamps to maintain exhaust system alignment.