GM Service Manual Online
For 1990-2009 cars only

The exhaust system incorporates the following components from the front to the rear:

    • An exhaust manifold front pipe
    • The catalytic converter
    • The resonator
    • The intermediate pipe
    • The muffler
    • The tail pipe

The exhaust manifold front pipe is welded to the catalytic converter. Both components are serviced as one unit. The exhaust crossover pipe is attached to the following exhaust manifolds:

  1. The front manifold
  2. The rear manifold

The intermediate pipe is welded to the converter outlet.

All pipe to manifold connections are the ball joint type. The ball joints allow angular movement for engine roll motion.

Catalytic Converter

The catalytic converter, resonator and the intermediate pipe are serviced as a complete unit. The catalytic converter is an emission control device. The catalytic converter is added to the exhaust system on gasoline engine cars in order to reduce pollutants from the exhaust gas stream. The catalyst in the monolith converter is not serviceable. The converter is the single bed type.

Notice: In order to avoid damage to the catalyst, use unleaded fuel only.

The catalytic converter contains a second oxygen sensor located near the converter outlet.

Heat Shields

Caution: Always reinstall any heat shield that is removed. Failure to do so may cause damage to other components. The post catalytic converter oxygen sensor is protected by a heat shield, which is attached to the underside of the vehicle.

The heat shields are attached to the vehicle underside of the body in order to reflect the heat of the exhaust system away from the body.

Exhaust System Hangers General Description

The exhaust system is supported by free hanging rubber mounts. The rubber mounts serve the following functions:


Object Number: 506320  Size: SH
    • Permit exhaust system movement
    • Support the exhaust system
    • Stop the transfer of noise into the passenger compartment
    • Stop the transfer of vibration into the passenger compartment.

The following conditions can cause exhaust system rattles and noise vibrations:

    • Component misalignment
    • Heat shield retention

Leave all the bolts or the nuts loose until all the components are properly aligned. Tighten the bolts and the nuts from the front to the rear of the vehicle.

Exhaust system maintenance is not required. Inspect the condition of the catalytic converter, the pipes, and the mufflers if the vehicle is raised for other service.