Our Top 3 Picks
You are not here to run a research project. You are here to find an Exhaust Manifold Converter that works and get on with it – these 3 are the ones we picked.
#1 – Toyota Camry 2.4L Exhaust Manifold Catalytic Converter
Best for: Owners of 2002-2006 Camry or Solara models seeking a direct fit replacement.
- Matches OE Part Number 25051-0H050
- $125.99 entry price
- 3.9 rating from 150 ratings
- Editorial score: 8.2/10
OE Part Number: 25051-0H050 · Weight: 13.42 pounds
#2 – Nissan Altima 2007-2012 2.5L Exhaust Manifold Kit
Best for: Users requiring a stainless steel manifold with front and rear positions.
- Stainless steel body construction
- $172.97 mid price
- 4.3 rating from 148 ratings
- Editorial score: 7.6/10
OE Part Number: 16593, 40800, 641302, 18258, 674-933, 54782, 324424, 643090, 40919, 58363, 18343
#3 – AutoShack EM775001 Front Exhaust Manifold Catalytic Converter
Best for: Buyers needing an ISO/IATF 16949 certified unit with included hardware.
- Includes gasket and hardware
- $156.35 mid price
- 4.9 rating from 14 ratings
- Editorial score: 8.1/10
OE Part Number: 12604220, 12607896, 674999, 674-999, 16611 · Weight: 17.2 pounds
If you are shopping for a different SUV, see the best exhaust manifold catalytic converter for hyundai santa fe sport.
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. The picks on this page were selected from those 46 candidates against this topic’s requirements. 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).
Our Verdict and How We Chose
The Toyota Camry 2.4L Exhaust Manifold Catalytic Converter is the top choice for its direct fit design that resolves P0420 engine codes and meets EPA standards for an Exhaust Manifold with Converter.
Choosing the correct manifold catalytic converter can be difficult when you need to ensure the unit matches your specific engine block casting to avoid port mismatches. A mismatch in geometry often results in the manifold bolting to the head while the exhaust tubes fail to align with the cylinder ports.
The Toyota Camry 2.4L Exhaust Manifold Catalytic Converter provides a direct fit for 2002-2006 models to clear those fitment hurdles. You should consider the Nissan Altima 2007-2012 2.5L Exhaust Manifold Kit if you require a stainless steel body, or the AutoShack EM775001 if you need a kit that includes both hardware and a gasket.
We evaluated the exhaust manifold converter options we track against this topic’s criteria at ExtremeSpec Auto. The products in our comparison cover a price range from $125.99 to $172.97, with a median price of $151.
You can also view our detailed Camry Catalytic Converter analysis for specific 2.4L engine configurations.
What this page concludes
- Top pick: Toyota Camry 2.4L Exhaust Manifold Catalytic Converter at $125.99 (OE Part Number: 25051-0H050).
- Also picked: Nissan Altima 2007-2012 2.5L Exhaust Manifold Kit at $172.97; AutoShack EM775001 Front Exhaust Manifold Catalytic Converter at $156.35.
- We compared 10 Exhaust Manifold Converters, from $105.90 to $255, median $151.
- Best buyer rating in the comparison: Nissan Altima 2007-2012 2.5L Exhaust Manifold Kit at 4.3/5 from 148 ratings.
Full Comparison Table
| Product | Price | Rating | OE Part Number | OEM Flange Compatibility |
|---|---|---|---|---|
| Toyota Camry 2.4L Exhaust Manifold Catalytic Converter | $125.99 | 3.9 (150 ratings) | 25051-0H050 | OE Part Number: 25051-0H050 |
| Nissan Altima 2007-2012 2.5L Exhaust Manifold Kit | $172.97 | 4.3 (148 ratings) | 16593, 40800, 641302, 18258, 674-933, 54782, 324424, 643090, 40919, 58363, 18343 | Multiple OE Numbers |
| AutoShack EM775001 Front Exhaust Manifold Catalytic Converter | $156.35 | 4.9 (14 ratings) | 12604220, 12607896, 674999, 674-999, 16611 | 4 Bolt connection |
| Honda Civic & Acura EL Exhaust Manifold Catalytic Converter | $114.99 | 5.0 (3 ratings) | 18160-PLM-A00, 18160-PLM-A50, 674-608, 16373, 101304 | OE Part Number: 18160-PLM-A00 |
| 674-318 674-319 Front and Rear Manifold Catalytic Converters | $255 | 5.0 (2 ratings) | Front: 41094; 49762; 50290; 641555; 18407556503; 18407556989; 18407558769; 18407563736 ED503106D; 18407563738; 18407565099; 18407596877; 18407596878; 18407646692; 18407646694. Rear: 41095; 49763; 50291; 18407556504; 18407556990; 18407558770; 18407563737; 18407596879; 18407646693; ED503107D | Front: 41094; Rear: 41095 |
| 53189 679-550 679-551 Manifold Catalytic Converter | $151 | 5.0 (2 ratings) | 53189, 679-550, 679-551, 68249199AA, 68249198AA | OE Part Number: 53189 |
| AutoShack EMCC773610 Exhaust Manifold Catalytic Converter | $115.87 | 5.0 (1 ratings) | 673608, 673-608, 4230 | OE Part Number: 673608 |
| AutoShack EMCC774145 Exhaust Manifold Catalytic Converter | $145.62 | 4.4 (10 ratings) | Not stated | — |
| AutoShack EMCC774813 Exhaust Manifold Catalytic Converter | $105.90 | 4.8 (6 ratings) | 250510H011, 250510H040, 2505128040, 2505128101 | OE Part Number: 250510H011 |
| 674-292 52022459AA Manifold Catalytic Converter | $205 | 4.7 (3 ratings) | 674-292, 674-293, 52022458AA, 52022459AA, 68190012AA, 68190013AA, 68190012AB, 68190013AB | OE Part Number: 674-292 |
Prices are approximate and move frequently – check the current price before deciding. “Not stated” means the manufacturer listing does not give that figure – we do not estimate it.
The Toyota Camry 2.4L Exhaust Manifold Catalytic Converter offers the strongest price-to-spec ratio because it provides a direct fit for the 2.4L engine at a $125.99 price point.
The Picks Reviewed in Detail
The 3 picks below run from $125.99 to $172.97, reviewed in rank order.
Toyota Camry 2.4L Exhaust Manifold Catalytic Converter
The Toyota Camry 2.4L Exhaust Manifold Catalytic Converter made this list because it specifically targets the 2002-2006 Camry 2.4L engine and provides a direct fit design. We selected this model for its ability to resolve the P0420 engine code while maintaining compliance with EPA and OBD2 regulations.
What we like: This unit features a direct fit design that requires no cutting or welding, which simplifies the replacement process for the owner. It is priced at $125.99, offering a significant cost reduction compared to dealership-sourced manifold assemblies. The product is rated 3.9 by 150 buyers, providing a solid track record for this specific vehicle fitment.
Keep in mind: This converter is not CARB compliant and cannot be used in California or Colorado. You should verify your specific vehicle’s OE part number against 25051-0H050 to ensure the manifold geometry aligns with your engine block casting before ordering.
Nissan Altima 2007-2012 2.5L Exhaust Manifold Kit
The Nissan Altima 2007-2012 2.5L Exhaust Manifold Kit is included because it offers a high-quality stainless steel construction and matches a wide range of OE reference numbers. While it is not a Camry-specific part, it represents a high-performing manifold option for users seeking stainless steel durability and federal emissions compliance.
What we like: The use of stainless steel for the body material provides a durable alternative to standard cordierite or cast iron manifolds. It features a 5-bolt welded flange on the front and a 3-bolt welded flange on the rear to ensure a secure connection. With a 4.3 rating from 148 ratings, this kit demonstrates strong reliability in its category.
Keep in mind: This kit is restricted for use in CA, NY, CO, and ME. Because it is designed for the Nissan Altima 2.5L, it will not fit a Toyota Camry engine; you must confirm your engine type before purchasing.
AutoShack EM775001 Front Exhaust Manifold Catalytic Converter
The AutoShack EM775001 Front Exhaust Manifold Catalytic Converter made the list due to its high 4.9 rating and its ISO/IATF 16949 certification. It serves as a high-reliability option that meets OEM specifications for various truck and SUV applications.
What we like: This converter includes the necessary hardware and a gasket, which simplifies the installation process onto an existing exhaust system. It holds a 4.9 rating from 14 buyers and carries a 6-month warranty for added peace of mind. The unit weighs 17.2 pounds, reflecting its heavy-duty construction.
Keep in mind: This specific model is a replacement for 2007-2012 Chevrolet Colorado and GMC Canyon 2.9L engines. It is not a Toyota Camry part, and you should check your vehicle’s specific requirements before purchase.
Off-road owners might prefer to see the M-AUTO Jeep Wrangler Exhaust Manifold review for heavy-duty use.
The Specs That Decide This Purchase
Substrate Material Composition
Substrate material composition determines the longevity of the unit and its ability to remain street-legal. You should look for precious metal coatings and EPA-compliant materials to ensure the unit resolves P0420 engine codes without failing emissions tests. The Toyota Camry 2.4L Exhaust Manifold Catalytic Converter uses a coating of precious metals to purify emissions, while the Nissan Altima 2.5L Exhaust Manifold Kit utilizes a stainless steel body. Because these are direct replacements rather than high-flow performance upgrades, they prioritize restoring factory emissions standards over maximizing flow volume.
OEM Flange Compatibility
OEM flange compatibility is the most critical factor for ensuring a proper fit without cutting or welding. You must verify that the flange geometry matches your engine block casting to avoid a port mismatch where the manifold bolts to the head but the exhaust tubes do not align. The Toyota Camry 2.4L Exhaust Manifold Catalytic Converter is designed for OE Part Number 25051-0H050, while the Nissan Altima 2.5L Exhaust Manifold Kit supports multiple references including 16593 and 40800. The AutoShack EM775001 Front Exhaust Manifold Catalytic Converter uses a 4-bolt connection and is designed to meet specific OEM specifications for its target vehicle.
Flow Rate Specifications
Flow rate specifications for these components are typically designed to match original equipment (OE) performance rather than providing a high-flow increase. If you need to restore factory power and pass inspections, these direct replacement units are the correct choice. The Toyota Camry 2.4L Exhaust Manifold Catalytic Converter and the AutoShack EM775001 Front Exhaust Manifold Catalytic Converter both provide direct installation onto existing systems. Because these products are not marketed as “high-flow” performance upgrades, they are intended to restore the vehicle to its original operational state.
Heat Dissipation Rating
Heat dissipation rating determines the unit’s resistance to substrate melting during high-temperature operation. You should choose a manifold that complies with EPA and OBD2 regulations to ensure the internal substrate remains intact under load. The Toyota Camry 2.4L Exhaust Manifold Catalytic Converter is EPA compliant but not CARB compliant, meaning it is not legal for use in California or Colorado. The Nissan Altima 2.5L Exhaust Manifold Kit is also restricted in those states, as well as New York and Maine. Always confirm your local state requirements before ordering, as many of these units are only permitted for EPA Federal Emission Equipped Vehicles.
For those interested in high-performance options, explore the Graywerks 101122 performance review.
Understanding physical dimensions is key, so learn how to choose your exhaust manifold converter weight.
What You Need vs What These Picks Deliver
Match the job you actually need done to what it requires, then check whether anything on this page reaches that level. Where nothing does, the row says so.
| What you want to do | What that needs | What clears it here |
|---|---|---|
| Clear a P0420 engine code | EPA and OBD2 compliance | Toyota Camry 2.4L Exhaust Manifold Catalytic Converter |
| Replace a failed converter on a 2002-2006 Camry | OE Part Number 25051-0H050 | Toyota Camry 2.4L Exhaust Manifold Catalytic Converter |
| Match a specific manifold geometry | OE Part Number matching | None of these (requires a manifold specific to the engine block casting) |
| Ensure legal street use in California | CARB compliance | None of these (requires a CARB-certified converter) |
Thresholds are the levels this category is generally held to, not manufacturer claims. Check them against your own workload before buying.
Who Buys Exhaust Manifold Converters, and What It Really Costs
Who buys an Exhaust Manifold Converter, and what each one needs
- Commuter car owners — EPA Tier 3 / Euro 6 compliance to ensure legal street legality
- DIY mechanics — OE Part Number Matching to ensure the manifold geometry aligns with the specific engine block casting
- Performance tuners — High-Flow Ceramic Substrates to achieve the benchmark for aftermarket performance
- Fleet maintenance managers — OEM Cast Iron Manifolds as the baseline for thermal mass and durability
- Off-road hobbyists — Heat Shield clearance to ensure the unit fits the engine without preventing shield reinstallation
What to budget for on top of the Exhaust Manifold Converter
- Exhaust gaskets — required to create a seal between the manifold and the cylinder head
- Mounting hardware — necessary to secure the unit if the original bolts are stripped or corroded
- Heat shielding — required to protect surrounding components from the high temperatures of the manifold
- Installation tools — required for specialized torqueing and removal of the exhaust assembly
What you can leave out of the budget
- Decorative heat wraps — unnecessary if the manifold is designed for proper heat dissipation
- Generic cleaning sprays — unnecessary as the unit is a replacement part and does not require detailing
Where this kind of product is normally sold
- Specialized auto parts retailers — provides access to OE Part Number Matching and technical support
- Online marketplaces — offers competitive pricing but requires careful verification of substrate material
- Local repair shops — provides professional installation and immediate verification of port alignment
- OEM dealerships — ensures perfect fitment but typically carries a significant price premium
To better understand your options, view the different types of exhaust manifold converters.
Buying Questions Answered
Does the exhaust manifold catalytic converter include mounting hardware?
The AutoShack EM775001 includes both a gasket and hardware to ensure the unit can be installed onto the existing exhaust system. For the Toyota Camry 2.4L Exhaust Manifold Catalytic Converter and the Nissan Altima 2.5L Exhaust Manifold Kit, you should confirm the hardware requirements with the manufacturer or a local supplier before ordering.
Will the manifold warp or crack under extreme heat?
The Nissan Altima 2.5L Exhaust Manifold Kit uses stainless steel, which provides better resistance to the high temperatures of an exhaust system than standard carbon steel. To prevent substrate melting or manifold cracking, you must verify that the specific model is heat-treated to meet the thermal requirements of your engine’s exhaust output.
Who Should Skip These Exhaust Manifold Converters
The Toyota Camry 2.4L Exhaust Manifold Catalytic Converter is not CARB compliant. You cannot use this product for legal street use in California or Colorado as it does not meet the specific state emissions standards required for those regions.
You should confirm your specific OE part number before ordering to ensure the manifold geometry aligns with your engine block casting. Because these components are heavy and involve exhaust systems, you should have a qualified installer perform the mounting to ensure the unit does not interfere with your heat shields.
If you require a catalytic converter that is CARB compliant for use in California, none of the products on this page meet that requirement. These options are strictly for federal emissions standards and do not provide the specific substrate chemistry required for California’s stricter regulations.