How to replace the left exhaust manifold (3.4L) on 2003 Chevrolet Impala?

A technician should begin left Exhaust Manifold (3.4L) replacement by disconnecting the negative Battery Cable and removing the air cleaner intake duct. Begin by first removing the right engine mount strut bracket followed by the thermostat bypass pipe. Then proceed with removing the exhaust crossover pipe heat shield bolts and the attached heat shield. Start by removing the exhaust crossover pipe nuts from the left Exhaust Manifold before you detach the left Exhaust Manifold heat shield bolts as well as the heat shield itself. The service requires workers to remove the left Exhaust Manifold nuts followed by the removal of the manifold and also the left Exhaust Manifold Gasket. When installing the new gasket and manifold to the left Exhaust Manifold you must first clean then inspect the mating surfaces. Follow installation of the left Exhaust Manifold nuts by tightening them to 16 nm (12 ft. Lbs.) then fasten the left Exhaust Manifold heat shield with its bolts while tightening them to 10 nm (89 inch lbs.). The exhaust crossover pipe receives its nuts first at the left Exhaust Manifold with 25 nm (18 ft. Lbs.) torque before attaching the exhaust crossover pipe heat shield and its bolts at 10 nm (89 inch lbs.). The maintenance sequence ends with the installation of the thermostat bypass pipe along with the right engine mount strut bracket and the air cleaner intake duct before reattaching the negative Battery Cable.

OEM 2003 Chevrolet Impala Exhaust Manifold

Engine Exhaust Manifold

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2003 Chevrolet Impala Exhaust Manifold, Driver Side Part Number: 12568405
$204.26 MSRP: $303.21
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Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Position: Driver Side
- Item Weight: 5.10 Pounds
- Item Dimensions: 16.9 x 5.9 x 5.4 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 12568405
- Warranty: This genuine part is guaranteed by GM's factory warranty.
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Fits the following 2003 Chevrolet Impala Submodels:
- Base | 6 Cyl 3.4 L GAS
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2003 Chevrolet Impala Exhaust Manifold, Passenger Side Part Number: 24507481
Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Position: Passenger Side
- Item Weight: 8.30 Pounds
- Item Dimensions: 17.7 x 10.5 x 9.6 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 24507481
- Warranty: This genuine part is guaranteed by GM's factory warranty.
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Fits the following 2003 Chevrolet Impala Submodels:
- Base, LS, LS Sport | 6 Cyl 3.8 L GAS
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2003 Chevrolet Impala Exhaust Manifold, Passenger Side Part Number: 12578348
Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Position: Passenger Side
- Item Weight: 10.20 Pounds
- Item Dimensions: 21.4 x 7.4 x 7.5 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 12578348
- Warranty: This genuine part is guaranteed by GM's factory warranty.
More Info
Fits the following 2003 Chevrolet Impala Submodels:
- Base | 6 Cyl 3.4 L GAS
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2003 Chevrolet Impala Exhaust Manifold, Passenger Side Part Number: 24503918
Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Position: Passenger Side
- Item Weight: 7.90 Pounds
- Item Dimensions: 16.5 x 8.5 x 4.8 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 24503918
- Warranty: This genuine part is guaranteed by GM's factory warranty.
More Info
Fits the following 2003 Chevrolet Impala Submodels:
- Base, LS, LS Sport | 6 Cyl 3.8 L GAS
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2003 Chevrolet Impala Exhaust Manifold, Driver Side Part Number: 24504379
Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Position: Driver Side
- Item Weight: 8.90 Pounds
- Item Dimensions: 21.2 x 9.0 x 6.5 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 24504379
- Warranty: This genuine part is guaranteed by GM's factory warranty.
More Info
Fits the following 2003 Chevrolet Impala Submodels:
- Base, LS, LS Sport, SS | 6 Cyl 3.8 L GAS
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2003 Chevrolet Impala Exhaust Manifold, Passenger Side Part Number: 24506309
Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Position: Passenger Side
- Item Weight: 14.70 Pounds
- Item Dimensions: 19.2 x 6.7 x 4.4 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 24506309
- Warranty: This genuine part is guaranteed by GM's factory warranty.
More Info
Fits the following 2003 Chevrolet Impala Submodels:
- Base | 6 Cyl 3.4 L GAS
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2003 Chevrolet Impala Exhaust Manifold, Driver Side Part Number: 10182321
Product Specifications
- Other Name: Manifold, Engine Exhaust Manifold; Manifold
- Position: Driver Side
- Item Weight: 5.40 Pounds
- Item Dimensions: 19.4 x 4.9 x 4.9 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 10182321
- Warranty: This genuine part is guaranteed by GM's factory warranty.
More Info
Fits the following 2003 Chevrolet Impala Submodels:
- Base | 6 Cyl 3.4 L GAS

2003 Chevrolet Impala Exhaust Manifold

With a comprehensive array of OEM 2003 Chevrolet Impala Exhaust Manifold, from fuel pumps to door handles, our website is a one-stop-shop for your needs. All our genuine 2003 Chevrolet Impala Exhaust Manifold are backed by the manufacturer's warranty and are offered at competitive prices in the market. Rest assured, you can shop with complete confidence.

2003 Chevrolet Impala Exhaust Manifold Parts and Q&A

Q: How to replace the left exhaust manifold (3.4L) on 2003 Chevrolet Impala?
A: A technician should begin left Exhaust Manifold (3.4L) replacement by disconnecting the negative Battery Cable and removing the air cleaner intake duct. Begin by first removing the right engine mount strut bracket followed by the thermostat bypass pipe. Then proceed with removing the exhaust crossover pipe heat shield bolts and the attached heat shield. Start by removing the exhaust crossover pipe nuts from the left Exhaust Manifold before you detach the left Exhaust Manifold heat shield bolts as well as the heat shield itself. The service requires workers to remove the left Exhaust Manifold nuts followed by the removal of the manifold and also the left Exhaust Manifold Gasket. When installing the new gasket and manifold to the left Exhaust Manifold you must first clean then inspect the mating surfaces. Follow installation of the left Exhaust Manifold nuts by tightening them to 16 nm (12 ft. Lbs.) then fasten the left Exhaust Manifold heat shield with its bolts while tightening them to 10 nm (89 inch lbs.). The exhaust crossover pipe receives its nuts first at the left Exhaust Manifold with 25 nm (18 ft. Lbs.) torque before attaching the exhaust crossover pipe heat shield and its bolts at 10 nm (89 inch lbs.). The maintenance sequence ends with the installation of the thermostat bypass pipe along with the right engine mount strut bracket and the air cleaner intake duct before reattaching the negative Battery Cable.