Intermediate Pipe 3.1L - Single Exh Chev/Olds

1. Raise and suitably support the vehicle.
2. Support the following components:

•	Intermediate Pipe

•

Muffler

•	Three Way Catalytic Converter




3. Remove the following components from the intermediate pipe:

•

Bolts

•

Hangers

•	Insulators

4. Cut the intermediate exhaust pipe from the muffler(s).




Important: Cut (1) must be made as close to the weld (2) as possible to ensure adequate overlap for clamping.




5. Remove the intermediate exhaust pipe bolts from the three way catalytic converter.
6. Remove the intermediate exhaust pipe.

1. Install the new intermediate exhaust pipe.



2. Install the clamp to the original muffler. Do not tighten the clamp nut.



3. Install the bolts to the three way catalytic converter.



4. Install the insulators, the hangers, and the bolts, as used.

Tighten

•	Tighten the clamp nut to 50 N·m (37 lb ft).

•	Tighten the bolts to the three way catalytic converter to 47 N·m (35 lb ft).

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

•	Lower the vehicle.

Intermediate Pipe Dual Exhaust Chevy/Olds

1. Raise and suitably support the vehicle. Refer to General Vehicle Lifting and Jacking in General Information.
2. Support the muffler, the intermediate pipe, and the three way catalytic converter.



3. Remove the bolts, the hangers, and the insulators, as used.



4. Cut the intermediate exhaust pipe from the right and left mufflers.

Important: 

•	The cut must be made as close to the right-hand muffler as possible to ensure adequate overlap for clamping.

•	The cuts must be made on the intermediate straight pipe closest to the curve coming out of the left-side muffler. Do not cut on the curve or bend.




5. Remove the intermediate exhaust pipe bolts from the three way catalytic converter.
6. Remove the intermediate exhaust pipe from the vehicle.

1. Install the new intermediate exhaust pipe to the vehicle and support.
2. Install the clamp to the original mufflers.
3. Install the bolts to the three way catalytic converter. Do not tighten the clamp nut.



4. Install the insulators, hangers, and bolts, as used.

Tighten

•	Tighten the clamp nuts to 50 N·m (37 lb ft).

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

•	Tighten the bolts to the three way catalytic converter to 47 N·m (35 lb ft).

•	Lower the vehicle.

Intermediate Pipe Dual Exhaust Pontiac/Buick

1. Raise the vehicle. Support the vehicle. Refer to General Vehicle Lifting and Jacking in General Information.
2. Support the mufflers, the intermediate pipe, and the three way catalytic converter.



3. Remove the bolts, the hangers, and the insulators, as used.

Important: The cuts must be made approximately 38 mm (1.5 mm) in order to ensure adequate overlap for clamping.




4. Cut the intermediate exhaust pipe from the right and left mufflers.



5. Remove the intermediate exhaust pipe bolts and gaskets from the three way catalytic converter.



6. Remove the intermediate exhaust pipe from the vehicle.

1. Install the new intermediate exhaust pipe to the vehicle and support.



2. Install a new gasket to the front flange of the intermediate exhaust pipe.
3. Install the clamps to the original mufflers.
4. Install the bolts to the three way catalytic converter. Do not tighten the clamp nuts.



5. Install the insulators, the hangers, and the bolts, as used.

Tighten

•	Tighten the clamp nuts to 50 N·m (37 lb ft).

•	Tighten the bolts to the three way catalytic converter to 45 N·m (33 lb ft).

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

6. Lower the vehicle.