Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISENGINE MECHANICALENGINE EXHAUST SYSTEMREPAIR INSTRUCTIONSEXHAUST SEAL REPLACEMENTINSTALLATION PROCEDURE

2008 Pontiac Grand Prix Base

Installation Procedure

2008 Pontiac Grand Prix BaseSECTION Installation Procedure

Fig 1: Exploded View Of Catalytic Converter & Muffler Components

Courtesy of GENERAL MOTORS CORP.

Install a NEW catalytic converter to muffler gasket (2).

Fig 2: Exhaust Manifold Pipe & Gasket

Courtesy of GENERAL MOTORS CORP.

If equipped with RPO LS4, install a NEW exhaust manifold pipe gasket (1).

Fig 3: Right Exhaust Manifold & Catalytic Converter Pipe

Courtesy of GENERAL MOTORS CORP.

If equipped with RPO L26/L32, install a NEW exhaust manifold pipe gasket (1).
Remove the catalytic converter. Refer to Catalytic Converter Replacement (L26) or Catalytic Converter Replacement (LS4) .

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.