The exhaust system's design will vary, according to the model designation and the intended use of the vehicle. In order to secure the exhaust pipe to the exhaust manifold, the exhaust system utilizes flange and seal-joint coupling. Subsequent connections in the exhaust system utilize a slip-joint coupling design, with a clamp and a U-bolt.

Notice: The three-way catalytic converter requires the use of unleaded fuel only. Using leaded fuel will damage the converter and other emission system components.

The catalytic converter, an emission control device on the gasoline engine, reduces hydrocarbon, carbon monoxide and nitrogen oxide pollutants from the exhaust gas. The catalytic converter's catalyst is not serviceable.

The muffler controls the exhaust noise levels. On some models, the muffler services with the exhaust pipe, not alone as a complete unit.

Hangers, attached to the frame, suspend the exhaust system. This allows some exhaust system movement, but not the transfer of noise and vibration into the vehicle.

Flat flanges and single-nut compression are two types of clamps used for connecting the exhaust system joints. Prior to assembly, be sure to coat the slip-joints with the exhaust system sealer, in order to prevent leakage.

Misalignment of exhaust system parts may cause rattle and noise vibration in the exhaust system. Leave all of the nuts and bolts loose, until all parts are properly aligned. After proper alignment, tighten the nuts and bolts, working from the front to the rear of the vehicle.

Conditions affecting the exhaust system performance, such as excessive back pressure, are noticeable by their effect on engine performance. However, additional faulty vehicle components, such as emission control devices, have the same effect on engine performance. For further information, refer to Engine Controls.

Caution: Wear protective goggles and gloves in order to avoid serious personal injury when removing exhaust parts.

An accumulation of dirt and corrosion may make removing exhaust components difficult. A penetrating oil, used on the threads of U-bolts, may 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.

Check for proper alignment when installing a new exhaust pipe/muffler or tailpipe, on any model. Misaligned parts usually cause rattles and noise vibrations in the exhaust system. When aligning the system, leave all nuts/bolts loose, until all parts are aligned. After properly aligning the system, tighten the nuts/bolts, working from the front to the rear of the vehicle. Replace all damaged exhaust system hangers, hanger brackets, and clamps, in order to maintain the exhaust system alignment.

Important: 

1. Refer to Oxygen Sensors in Engine Controls, when servicing the exhaust system requires removing and replacing the oxygen sensors.
2. Apply the GM P/N 9985020 sealer, or equivalent, to all slip-joint connections.
3. Replace the tailpipe when replacing the muffler.
4. Always use new nuts when installing the exhaust pipe to the exhaust manifold.
5. Before installing the new nuts, clean the exhaust manifold stud threads with a wire brush.