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 CROSSOVER PIPE REPLACEMENT (LS4)INSTALLATION PROCEDURE

2008 Pontiac Grand Prix Base

Installation Procedure

2008 Pontiac Grand Prix BaseSECTION Installation Procedure

Fig 1: Exhaust Crossover Pipe & Nuts

Courtesy of GENERAL MOTORS CORP.

Install the exhaust crossover pipe seal to the exhaust crossover pipe at the right exhaust manifold connection.
Install the exhaust crossover pipe.

NOTE: Refer to Fastener Notice .

Install the exhaust crossover pipe nuts.
Tighten: Tighten the nuts to 25 N.m (18 lb ft).
Install the exhaust crossover pipe heat shield.
Install the air cleaner intake duct. Refer to Air Cleaner Resonator Outlet Duct Replacement .
Install the engine sight shield. Refer to Upper Intake Manifold Sight Shield Replacement .

RENDER: 1.0x

NO RELATED

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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.