Exhaust Manifold Catalytic Converter for Honda Civic
$122.99 price checked August 2026
If you need a direct replacement for a 2001-2005 Honda Civic 1.7L engine, this is the right choice.
What the Civic Exhaust Manifold Is, and Who For
The Honda Civic 1.7L Exhaust Manifold Catalytic Converter is for owners of 2001-2005 models who need an exact-fit replacement that matches OE numbers 18160-PLM-A00 and 18160-PLM-A50.
Restoring your vehicle to its original exhaust flow and emissions profile ensures the engine runs as intended by the manufacturer. A properly fitted manifold maintains the correct geometry for exhaust gases to pass through the converter efficiently.
The Honda Civic 1.7L Exhaust Manifold Catalytic Converter achieves this by matching OE numbers 18160-PLM-A00 and 18160-PLM-A50 for a precise fit. It serves as an exact-fit kit specifically for the 2001-2005 Honda Civic 1.7L L4 engine.
Our comparison involved evaluating the exhaust manifold converter options we analyzed to identify the best fit for this specific application. This review is for those seeking a direct replacement that matches factory specifications.
For a detailed performance breakdown, see our full review of the Graywerks 101122.
How ExtremeSpec Auto picked: we started from the 59 most-reviewed exhaust manifold converter listings in our retail dataset, removed duplicates, accessories and off-category products, and 46 qualified. This product is one of 10 from that pool chosen for a full review. Our scores blend buyer satisfaction (60%), price position against comparable products (25%) and rating volume (15%). Specifications come from manufacturer listings and ratings from verified Amazon buyer reviews (data checked August 2026).
The Short Answer on the Civic Exhaust Manifold
Best for: you own a 2001-2005 Honda Civic 1.7L L4 engine and need a direct replacement for the factory exhaust manifold.
We recommend this kit for $122.99.
- Pro: Matches OE numbers 18160-PLM-A00 and 18160-PLM-A50 for an exact-fit installation.
- Pro: Leak-resistant construction ensures exhaust gases stay within the manifold.
- Pro: Holds a 4.3 rating from 53 buyer ratings.
- Con: This unit is not CARB approved, which prevents legal use on California-equipped vehicles.
- Con: Shipping restrictions mean you cannot have this product delivered to the state of California.
Don’t buy this if: your vehicle was originally equipped with a California emissions system, as this part is not CARB approved.
Price assessment: At $122.99, the price is fair for a direct-replacement kit that includes both the manifold and the converter.
ExtremeSpec Auto score: 8.4/10 (data-driven – see “How we picked” above)
Off-road enthusiasts should view our comparison of the best exhaust manifold catalytic converter for jeep wrangler.
The Numbers on the Spec Sheet
Which Honda Civic models does this manifold catalytic converter fit?
This Honda Civic Exhaust Manifold fits 2001-2005 Honda Civic 1.7L L4 engines. The unit is a direct replacement that replaces the vehicle’s factory installed exhaust manifold.
Does it match my specific engine’s OE numbers?
The Honda Civic Exhaust Manifold matches OE numbers 18160-PLM-A00 and 18160-PLM-A50. These specific OE numbers ensure the manifold geometry aligns with the correct engine block casting.
Is this unit CARB approved for California?
This Honda Civic Exhaust Manifold is not CARB (California Air Research Board) approved. It cannot be shipped to the state of California and cannot be installed on a California equipped vehicle in the state of New York.
What are the part numbers for this assembly?
The Honda Civic Exhaust Manifold uses part numbers 673-608 and 674-608. These numbers identify the leak-resistant, exact-fit kit designed to conform to product standards.
| Compatible Engine | 2001-2005 Honda Civic 1.7L L4 |
| OE Numbers | 18160-PLM-A00, 18160-PLM-A50 |
| Part Numbers | 673-608 & 674-608 |
| Fitment Type | Direct replacement, exact-fit kit |
| CARB Approved | No |
| Shipping Restriction | Cannot ship to California |
The OE numbers 18160-PLM-A00 and 18160-PLM-A50 are the most critical specs to verify against your vehicle’s original parts before ordering.
Where this sits in the buyer data: Among the 31 products screened for this category, this one’s 4.3 rating places it #12, on 53 ratings – above the 6-rating median of that group, so the average rests on more feedback than most of its comparables. On price it undercuts 37 of them.
To better understand technical specifications, view our guide to exhaust manifold converter terms and specs.
Before You Buy: Civic Exhaust Manifold Checklist
The first thing to check is your vehicle’s specific engine block casting to ensure the manifold geometry aligns with your factory setup.
- ☐ Confirm your vehicle is a 2001-2005 Honda Civic with a 1.7L L4 engine
- ☐ Verify your OE part numbers match 18160-PLM-A00 or 18160-PLM-A50
- ☐ Check that your vehicle is not a California-equipped model
- ☐ Ensure you are not located in the state of California, as this unit is not CARB approved
- ☐ Verify the kit replaces the factory installed exhaust manifold as a direct replacement
You should not buy this product if your vehicle was originally manufactured for sale in California or if you require a CARB-approved converter.
Performance in Practical Terms
Leak-Resistant Construction
Leak-resistant construction on the Civic Exhaust Manifold ensures that exhaust gases remain contained within the system. Because this unit is a direct replacement for the factory installed exhaust manifold, the seal integrity helps maintain proper backpressure and prevents exhaust fumes from escaping into the engine bay.
If you are concerned about engine performance, this construction supports a smoother running engine by maintaining the intended flow path. It addresses the primary need of restoring exhaust integrity to the 1.7L L4 engine, ensuring the vehicle operates as designed by the manufacturer.
Exact-Fit Kit Compatibility
Exact-fit kit compatibility is defined by the Civic Exhaust Manifold matching OE numbers 18160-PLM-A00 and 18160-PLM-A50. These specific part numbers ensure the manifold geometry aligns with your 2001-2005 Honda Civic engine block casting to prevent port mismatches.
The Civic Exhaust Manifold includes part numbers 673-608 and 674-608 to guarantee the manifold bolts to the head and the exhaust tubes align with the cylinder ports. You should confirm your vehicle’s factory OE numbers before ordering, as this kit is not CARB approved and cannot be installed on California equipped vehicles.
How the Civic Exhaust Manifold Compares to Alternatives
How does this compare to other exhaust manifold converters?
The Civic Exhaust Manifold provides a direct-fit solution for 2001-2005 Honda Civic 1.7L L4 engines, matching OE numbers 18160-PLM-A00 and 18160-PLM-A50.
- The Civic Exhaust Manifold costs $122.99, which is $8 more than the Honda Civic & Acura EL Exhaust Manifold Catalytic Converter.
- The Toyota Camry 2.4L Exhaust Manifold Catalytic Converter is $3 more expensive than this product.
- The Puermto Exhaust Manifold Catalytic Converter is $3.45 more expensive than the Civic Exhaust Manifold.
- The AutoShack EMCC773610 Exhaust Manifold Catalytic Converter is $7.12 cheaper than this product.
- The Civic Exhaust Manifold holds a 4.3 rating from 53 buyers, while the Honda Civic & Acura EL Exhaust Manifold Catalytic Converter has a higher 5.0 rating.
If you require the lowest possible price, the Honda Civic & Acura EL Exhaust Manifold Catalytic Converter is the better pick at $114.99.
Compared to an expensive dealership part, this unit serves as a direct replacement for the factory installed exhaust manifold. While the dealership may offer an OEM cast iron manifold with specific thermal mass, this kit provides the same geometry for the 1.7L L4 engine. You should verify your specific engine block casting matches the OE numbers 18160-PLM-A00 or 18160-PLM-A50 before ordering. Because this product is not CARB approved, it cannot be shipped to or installed on a California-equipped vehicle.
You can find a detailed spec breakdown by viewing our full review of the EM775001 Catalytic Converter.
Drivers seeking a specific layout can find our full review of the passenger side Exhaust Manifold Converter.
Questions Buyers Ask About the Civic Exhaust Manifold
Is the Civic Exhaust Manifold worth the price for a basic repair?
The Civic Exhaust Manifold provides a direct replacement for the factory unit at a price of $122.99. You get an exact-fit kit that replaces the vehicle’s factory installed exhaust manifold while maintaining a leak-resistant seal.
Can I have this shipped to my house if I live in California?
No, this product cannot be shipped to the state of California because it is not CARB approved. You must confirm your local state requirements before ordering to ensure the unit can be legally delivered to your address.
Will the Civic Exhaust Manifold fit my 2001-2005 Honda Civic?
Yes, the Civic Exhaust Manifold is compatible with 2001-2005 Honda Civic 1.7L L4 engines. It matches OE numbers 18160-PLM-A00 and 18160-PLM-A50 to ensure the manifold geometry aligns with your specific engine block casting.
What are the specific part numbers for this manifold?
The Civic Exhaust Manifold corresponds to part numbers 673-608 and 674-608. These numbers identify the specific kit required to replace the original manifold on a 1.7L L4 engine.
If you are looking for different configurations, explore the alternatives to an exhaust manifold converter.
Is the Civic Exhaust Manifold Right for You?
The Civic Exhaust Manifold suits 4 kinds of buyer and is the wrong choice for 3 jobs, listed below with the reason for each.
Who the Civic Exhaust Manifold is for, and what it does well
Who the Civic Exhaust Manifold suits
- Budget-conscious commuters — The $122.99 price point makes it an affordable way to fix a failing exhaust system
- DIY car owners — The direct replacement, exact-fit kit allows for a straightforward installation without custom fabrication
- Honda Civic owners in non-California states — The part is specifically designed for the 2001-2005 1.7L L4 engine model
- Used car buyers — The leak-resistant design provides a reliable fix for a vehicle that may have a worn-out factory manifold
What the Civic Exhaust Manifold handles well
- Restoring factory exhaust flow — Replaces vehicle’s factory installed exhaust manifold
- Fixing exhaust leaks — Leak-resistant construction
- Standard engine maintenance — Conforms to product standards
- OEM-spec repairs — Matches OE Numbers 18160-PLM-A00 and 18160-PLM-A50
What the Civic Exhaust Manifold is the wrong choice for
- California vehicle registration — Not CARB approved and cannot ship to California
- New York legal compliance for CA vehicles — Cannot be installed on a California equipped vehicle in the state of New York
- High-performance racing modifications — Not a performance upgrade but a direct replacement for the factory part
What to budget alongside the Civic Exhaust Manifold, and what to skip
Worth buying at the same time
- Exhaust bolts — Required to secure the manifold to the cylinder head
- Gasket set — Necessary to ensure a seal between the manifold and the engine block
- Socket wrench set — Required to remove and install the heavy manifold component
- Penetrating oil — Needed to loosen rusted factory bolts during the replacement process
What you can skip
- Custom fabrication kits — Skip because this is an exact-fit kit
- Aftermarket performance headers — Skip because this is a direct replacement for the factory manifold
- Adaptation brackets — Skip because the part is designed to be a direct replacement
Where to Buy the Civic Exhaust Manifold
These retailers sell Exhaust Manifold Converter generally – we do not track which of them has this particular model in stock, so check availability and the current price with the retailer before making a trip.
- Advance Auto Parts (online and physical stores) — local availability and in-store returns
- RockAuto (online only) — extensive catalog breadth and competitive pricing
- Summit Racing Equipment (online only) — specialist performance and aftermarket options
- Amazon (online only) — wide variety of third-party brands
- eBay (online only) — finding specific OE replacements and used parts
- AutoZone (online and physical stores) — local availability and in-store returns
- O’Reilly Auto Parts (online and physical stores) — local availability and in-store returns
Final Verdict on the Civic Exhaust Manifold
If you own a 2001-2005 Honda Civic with a 1.7L L4 engine and need a direct replacement for the factory exhaust manifold, the Civic Exhaust Manifold is the correct choice at $122.99.
The Civic Exhaust Manifold matches OE numbers 18160-PLM-A00 and 18160-PLM-A50, ensuring the manifold geometry aligns with your specific engine block casting to prevent port mismatches.
The 4.3 rating from 53 buyers confirms this kit provides a leak-resistant, exact-fit replacement for the factory-installed manifold.
Skip it if: you are located in California or have a California-equipped vehicle, as this unit is not CARB approved and cannot be shipped to or installed on such vehicles.
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