Our Top 3 Picks
We went through 5 Exhaust Manifold Converter options to build this list. These 3 are the ones worth your time.
#1 – Nissan Altima 2.5L Exhaust Manifold Catalytic Converter
Best for: Owners seeking an exact-fit replacement for the factory installed manifold.
- Matches OE Part Number 14002-JA91E
- $152.99 (mid-range)
- 4.2 rating from 106 ratings
- Editorial score: 7.9/10
OE Part Number: 14002-JA91E
#2 – AutoShack EMCC774935 Nissan Altima Exhaust Manifold Converter
Best for: Buyers prioritizing broad OE compatibility and a budget-friendly price point.
- EPA OBDII Approved with 4 bolt connection
- $132.23 (entry-level)
- 3.9 rating from 18 ratings
- Editorial score: 7.4/10
OE Part Number: 14002-JA01E, 14002-JA02E, 14002-JA91E, 140E2JA02E, 140E2JA03E, 140E2JA92E, 674933, 674-933
#3 – Nissan Altima 2007-2012 2.5L Exhaust Manifold Kit
Best for: Users requiring a stainless steel manifold and a comprehensive kit for front and rear positions.
- Stainless steel body with welded flanges
- $172.97 (premium)
- 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
If you are shopping for a different vehicle, see our guide to Jeep Wrangler exhaust manifold catalytic converters.
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).
The Verdict, and the Basis for It
The Nissan Altima 2.5L Exhaust Manifold Catalytic Converter is the top choice for an Exhaust Manifold with Converter for Nissan Altima because it provides an exact-fit replacement for OE Part Number 14002-JA91E.
Finding a manifold that aligns perfectly with your engine’s cylinder ports can be difficult, as a port mismatch can leave you with a bolt-on part that doesn’t actually connect to the exhaust tubes. Selecting the wrong geometry often leads to installation failures or the need for costly custom fabrication.
The Nissan Altima 2.5L Exhaust Manifold Catalytic Converter solves this by providing a direct replacement kit for the 2.5L L4 engine. You should choose the AutoShack EMCC774935 if you need a budget-friendly option with a 4-bolt connection, or opt for the A-Premium manifold kit if you require a stainless steel construction with a 5-bolt front flange.
At ExtremeSpec Auto we evaluated the exhaust manifold converter options we track against this topic’s criteria. Our comparison covers a price range from $132.23 to $172.97, with a median price of $152.99.
A correctly fitted manifold and converter ensures your vehicle maintains proper exhaust flow and meets federal emissions standards for your 2007-2012 Nissan Altima. This allows for a seamless transition from the engine block to the rest of the exhaust system without performance drops.
The Nissan Altima 2.5L Exhaust Manifold Catalytic Converter is the ideal choice for achieving this fitment, specifically targeting the 14002-JA91E specification. Choose the AutoShack EMCC774935 instead for a 6-month warranty and ISO certification, or select the A-Premium kit if you need a front and rear position setup.
At ExtremeSpec Auto we evaluated the exhaust manifold converter options we track against this topic’s criteria. The products in our comparison range from $132.23 to $172.97, with a median price of $152.99.
You are likely looking for a replacement part that matches the specific 2.5L L4 engine configuration found in Nissan Altima models between 2007 and 2012. You need to verify your OE part number to ensure the manifold geometry aligns with your specific engine block casting.
The Nissan Altima 2.5L Exhaust Manifold Catalytic Converter fits this scenario by mirroring the factory-installed manifold dimensions. The AutoShack EMCC774935 is a better fit if you require an EPA OBDII approved unit, while the A-Premium kit is suitable for those needing a stainless steel body with specific welded flanges.
At ExtremeSpec Auto we evaluated the exhaust manifold converter options we track against this topic’s criteria. These options span a price range of $132.23 to $172.97, with a median price of $152.99.
The findings in brief
- Top pick: Nissan Altima 2.5L Exhaust Manifold Catalytic Converter at $152.99 (OE Part Number: 14002-JA91E).
- Also picked: AutoShack EMCC774935 Nissan Altima Exhaust Manifold Converter at $132.23; Nissan Altima 2007-2012 2.5L Exhaust Manifold Kit at $172.97.
- We compared 5 Exhaust Manifold Converters, from $104.99 to $172.97, median $152.99.
- 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 | OE Part Number |
|---|---|---|---|---|
| Nissan Altima 2.5L Exhaust Manifold Catalytic Converter | $152.99 | 4.2 (106 ratings) | 14002-JA91E | 14002-JA91E |
| AutoShack EMCC774935 Nissan Altima Exhaust Manifold Converter | $132.23 | 3.9 (18 ratings) | 14002-JA01E, 14002-JA02E, 14002-JA91E, 140E2JA02E, 140E2JA03E, 140E2JA92E, 674933, 674-933 | 14002-JA01E, 14002-JA02E, 14002-JA91E |
| 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 | 16593, 40800, 641302, 18258, 674-933 |
| APDTY 112876 Exhaust Manifold Catalytic Converter Assembly | $168.57 | 3.0 (4 ratings) | 14002-JA91E, 14002-JA01E, 14002-JA02E, 140E2-JA02E, 140E2JA02E | 14002-JA91E, 14002-JA01E, 14002-JA02E |
| Nissan Altima Exhaust Manifold Catalytic Converter | $104.99 | 2.4 (2 ratings) | 54360 | 54360 |
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 AutoShack EMCC774935 offers the strongest price-to-spec ratio because it includes a gasket and hardware for a 2.5L engine at the $132.23 price point.
Each Pick, Reviewed
The 3 picks below run from $132.23 to $172.97, reviewed in rank order.
Nissan Altima 2.5L Exhaust Manifold Catalytic Converter
The Nissan Altima 2.5L Exhaust Manifold Catalytic Converter made this list because it provides a high customer satisfaction rating of 4.2 from 106 ratings. It serves as a reliable standard replacement for the 2007-2012 L4 2.5L engine.
What we like: This unit is a direct replacement for the factory installed exhaust manifold and is designed to be leak-resistant. It matches OE Part Number 14002-JA91E, ensuring the manifold geometry aligns with your specific engine block casting.
Keep in mind: This converter is not CARB approved and cannot be shipped to or installed on California emissions equipped vehicles. You must confirm your vehicle is not a California emissions model before ordering.
AutoShack EMCC774935 Nissan Altima Exhaust Manifold Converter
We selected the AutoShack EMCC774935 Nissan Altima Exhaust Manifold Converter because it offers a budget-friendly price point of $132.23 and extensive OE compatibility. It is an ideal choice for those seeking a cost-effective replacement that meets EPA OBDII standards.
What we like: This converter includes the necessary gasket and hardware, simplifying the replacement process. It supports a wide range of OE numbers, including 14002-JA01E and 140E2JA92E, to ensure a proper fit for 2007-2013 models.
Keep in mind: This product is restricted for sale in California, Colorado, New York, and Maine.
Nissan Altima 2007-2012 2.5L Exhaust Manifold Kit
The Nissan Altima 2007-2012 2.5L Exhaust Manifold Kit earned a spot here because it provides a comprehensive solution using stainless steel construction. It offers a high rating of 4.3 from 148 buyers for the 2.5L base, S, and SL models.
What we like: The kit features a 5-bolt welded flange on the front and a 3-bolt welded flange on the rear for secure mounting. It is built with stainless steel, which serves as a durable alternative to standard OEM cast iron manifolds.
Keep in mind: This kit is restricted in CA, NY, CO, and ME. Because labor costs for exhaust work can exceed the part price, you should verify your local shop’s labor rates before purchasing.
Will this fit my specific engine size (2.5L vs 3.5L) without modifications?
These exhaust manifold converters are specific to the 2.5L L4 engine. Because Nissan Altimas use different engine configurations for the 3.5L, the bolt patterns and pipe diameters will not match. You must confirm your vehicle has the 2.5L engine before ordering to ensure the manifold bolts to the head and the exhaust tubes align with the cylinder ports.
How much does it cost to have a professional shop install this vs. a DIY job?
Labor costs for exhaust work often exceed the price of the part itself. Because these units require proper alignment to avoid port mismatches or heat shield interference, you should contact a local shop for a quote. Professional installation ensures the manifold is correctly seated to prevent the converter from overheating and failing prematurely.
What Separates One Exhaust Manifold Converter From the Next
OEM Bolt Pattern Alignment
OEM bolt pattern alignment is the primary factor for ensuring a direct replacement fits your Nissan Altima without custom fabrication. You should match the specific OE part numbers, such as 14002-JA91E or 14002-JA01E, to ensure the manifold geometry aligns with your engine block casting. The Nissan Altima 2.5L Exhaust Manifold Catalytic Converter and the AutoShack EMCC774935 both offer direct replacement fitment for the 2007-2012 L4 2.5L engine. If the bolt pattern does not match your specific casting, the manifold may bolt to the head while the exhaust tubes fail to align with the cylinder ports. Confirm your specific production year and engine code before ordering to avoid a port mismatch.
Catalytic Coating Density
Catalytic coating density determines if the converter meets Federal Emissions standards to prevent a Check Engine Light (CEL) or an emissions test failure. Look for products that specify EPA OBDII approval or Federal Emissions compliance to ensure the substrate meets legal requirements. The A-Premium Nissan Altima 2007-2012 2.5L Exhaust Manifold Kit is explicitly listed as EPA compliant for Federal Emissions. Because these units are not CARB approved, they cannot be shipped to or installed on California emissions-equipped vehicles. Always verify that the converter’s certification matches your state’s requirements, as non-compliant coatings will trigger a CEL.
Heat Shield Clearance
Heat shield clearance is a critical fitment check to ensure the new unit does not prevent the original heat shield from being reinstalled. You must confirm that the manifold’s outer diameter allows for standard clearance in the engine bay. While the data for these specific units does not list exact dimensions, the A-Premium kit uses a 5-bolt welded flange at the front and a 3-bolt welded flange at the rear to maintain standard positioning. If you are unsure about clearance, measure the distance between the exhaust port and the nearest structural component before purchasing to avoid interference issues.
Flow Rate Specifications
Flow rate specifications are often dictated by the material and construction of the manifold, such as the stainless steel used in the A-Premium kit. You should prioritize high-flow ceramic substrates over standard cordierite if you require higher throughput, though most direct replacements focus on matching factory flow. The AutoShack EMCC774935 includes a gasket and hardware, which helps maintain a seal to preserve intended flow rates. Because these products are designed as direct replacements for the 2.5L engine, they are engineered to balance backpressure with emissions. Check the manufacturer’s flow rating if you plan to use the converter on a high-performance application.
Some owners prefer different configurations, so consider these alternatives to an exhaust manifold converter.
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 |
|---|---|---|
| Replace a failed manifold and converter | 14002-JA91E OE match | Nissan Altima 2.5L Exhaust Manifold Catalytic Converter, AutoShack EMCC774935 |
| Upgrade to a high-flow exhaust manifold | High-Flow Ceramic Substrate | None of our picks provide high-flow ceramic; you need a high-flow performance manifold |
| Replace the converter on a 2007-2012 Altima | Federal Emissions compliance | Nissan Altima 2.5L Exhaust Manifold Catalytic Converter, AutoShack EMCC774935, A-Premium |
| Replace the manifold and converter as a kit | Front and Rear position | A-Premium |
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 drivers — EPA Tier 3 / Euro 6 compliance for legal street legality
- DIY mechanics — OE Part Number Matching to ensure manifold geometry aligns with the engine block casting
- Performance tuners — High-Flow Ceramic Substrates to exceed the benchmark of standard cordierite
- Fleet owners — OEM Cast Iron Manifolds as the baseline for thermal mass and durability
- Off-road enthusiasts — Heat Shield Interference clearance to ensure the unit fits the engine and surrounding components
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 and prevent vibration-induced failure
- Installation tools — Needed to remove the old unit and torque the new manifold to spec
- Heat shielding — Required if the converter geometry prevents the original shield from being reinstalled
What you can leave out of the budget
- Decorative heat wraps — Unnecessary for meeting thermal mass requirements or legal standards
- Generic oxygen sensors — Not required for the physical installation of the manifold converter
Where this kind of product is normally sold
- Aftermarket auto parts retailers — Offers a wide selection of high-flow options and local warranty handling
- Online specialty warehouses — Provides access to specific OE Part Number Matching units with shipping included
- Local repair shops — Provides professional installation and immediate verification of port alignment
Questions Buyers Ask Before Choosing
Is this a high-flow converter or a standard OEM replacement?
The Nissan Altima 2.5L Exhaust Manifold Catalytic Converter and the AutoShack EMCC774935 are designed as direct replacements for factory installed units rather than high-flow performance parts. These components focus on meeting federal emissions standards and maintaining the original manifold geometry for the 2.5L L4 engine. Because these are standard replacements, they prioritize emissions compliance over the increased airflow found in aftermarket high-flow substrates.
Does the material degrade or “melt” under high heat after a few thousand miles?
The A-Premium Nissan Altima 2007-2012 2.5L Exhaust Manifold Kit utilizes stainless steel for the body material to resist thermal degradation. To prevent the converter from overheating or melting, ensure the unit is not installed on a vehicle with California emissions requirements, as these parts are not CARB approved. If the manufacturer data does not specify a heat-treatment standard for the substrate, verify that the manifold aligns perfectly with the cylinder ports to prevent heat buildup caused by port mismatches.
To better understand the technical requirements, view the exhaust manifold converter terms and specs explained.
Who Should Skip These Exhaust Manifold Converters
Shipping restrictions apply to all three options because they are not CARB approved. You cannot ship these products to the state of California, nor can they be installed on a California emissions equipped vehicle in the state of New York.
If you require a high-flow exhaust manifold, none of the options on this page meet that requirement. These units do not feature a high-flow ceramic substrate, which is the benchmark for performance-oriented aftermarket upgrades over standard cordierite.
If you need a high-flow ceramic substrate, you should look for a performance-tier manifold specifically designed for increased airflow. If you are looking for a different vehicle, see the best exhaust manifold catalytic converter for hyundai santa fe sport.