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When a worn or damaged exhaust manifold affects your Mitsubishi Eclipse, you can expect reduced engine efficiency, louder operation, and potential exhaust leaks that affect emissions and performance. Choosing the right manifold matters because it determines how effectively exhaust gases exit the engine, how well the part seals at the flange, and how long it will last under heat and vibration.This guide covers five shortlisted exhaust manifolds selected for compatibility with the Mitsubishi Eclipse and strong performance on key criteria. We evaluated fitment, sealing reliability, thermal durability, and installation practicality to help you make a practical choice. Read on to see which options made the list and why they stood out in our evaluation.
Looking for other parts? See all Mitsubishi Eclipse parts & accessories.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | A-Premium Front Catalytic Converter Kit Compatible with Mitsubishi Eclipse 2006–2012 2.4L |  |
| Best Quality Built to a higher standard if you want something more solid | Dorman Driver Side Exhaust Manifold Kit (includes gaskets and hardware) |  |
| Best Budget The cheapest option that still gets the job done reliably | SCITOO Front Catalytic Converter / Exhaust Manifold Fit for Mitsubishi Eclipse 2.4L (Direct Replacement) |  |
| Highest Rated A top-rated pick with lots of positive feedback | DNA MOTORING Factory-Style Catalytic Converter Assembly for 2006–2012 Mitsubishi Eclipse 2.4 |  |
| Best Seller A high-volume bestseller chosen again and again | Auto Dynasty Front Dual Catalytic Converter Exhaust Manifold for Mitsubishi Eclipse 2.4L (2006–2012) |  |
1. A-Premium Front Catalytic Converter Kit Compatible with Mitsubishi Eclipse 2006–2012 2.4L
| Vehicle Fitment | Mitsubishi Eclipse 2006-2012 L4 2.4L |
|---|---|
| EPA Compliant | Yes (federal) |
| Position | Front |
| Body Material | Stainless Steel |
| Mounting Hardware | Included |
This A-Premium front catalytic converter kit is a direct-fit replacement for the Mitsubishi Eclipse 2006–2012 2.4L, intended to restore emissions control and keep the exhaust system functioning to federal standards. It installs at the front position of the exhaust, uses welded 6-bolt inlet and 4-bolt outlet flanges for a factory-style connection, and includes the necessary mounting hardware and gaskets for a straightforward swap. Constructed from stainless steel and marketed as EPA compliant for federal applications, the unit aims to reduce emissions while matching the original routing and flange locations so it can be used with the stock manifold and downstream components. The one-year unlimited-mileage guarantee offers short-term peace of mind, but state restrictions mean it cannot be used in California, New York, Colorado, or Maine. Buyers should expect a relatively simple bolt-on replacement when the vehicle requires a front catalytic converter, and verify state and vehicle emission labels before purchase.
Best for: Balanced buyers who want a factory-style, direct-fit replacement to restore emissions performance on a Mitsubishi Eclipse 2006–2012 without major modifications.
Less Ideal for: Owners in states with stricter emissions laws or those who prefer dealer-sourced factory parts for long-term warranty and support should look elsewhere.
- Direct-fit design with welded 6-bolt inlet and 4-bolt outlet flanges for straightforward installation
- Stainless steel construction resists corrosion compared with lower-grade materials
- Includes mounting hardware and gaskets to simplify replacement
- Marketed as EPA compliant for federal emissions applications
- Not legal for sale or use in California, Colorado, New York, and Maine due to state emissions rules
- Limited manufacturer track record compared with long-established OEM suppliers
Verdict: A direct-fit stainless steel front catalytic converter kit that restores emissions control on 2006–2012 Mitsubishi Eclipse 2.4L models while simplifying installation.
2. Dorman Driver Side Exhaust Manifold Kit (includes gaskets and hardware)
| Material | Cast Iron |
|---|---|
| Manufacturer | Dorman Products |
| Bolt Pattern (Number of Holes) | 6 |
| Manufacturer Part Number | 674-522 |
This Dorman exhaust manifold kit replaces a warped or cracked driver-side manifold with a ductile cast iron unit designed for durability under high heat. It is supplied as a complete repair kit with the manifold, manifold gasket, flange gasket, three studs and three nuts so you can perform a single-purchase replacement without repeated trips for parts. The part is reverse-engineered to match factory fit for a straightforward install and the machined exterior suggests decent sealing surfaces at the flanges. Practical buyers will appreciate the emphasis on higher-grade iron to resist future cracking and the included hardware that streamlines installation. Limitations are typical of replacement manifolds: it is a direct replacement rather than a performance header, so it will not increase power or significantly change exhaust tone, and buyers should confirm exact Scion xD engine and year fitment before ordering.
Best for: Convenience-driven owners seeking a straightforward, one-purchase repair solution who prioritize a reliable factory-style replacement and minimal parts sourcing.
Less Ideal for: Enthusiasts seeking performance exhaust upgrades or owners who want an aftermarket header for increased power and sound should look elsewhere.
- Complete kit includes manifold plus gaskets and hardware for a single-order repair
- Constructed from ductile cast iron to better resist warping and cracking from heat
- Reverse-engineered for direct-fit installation to match factory mounting points
- Machined exterior surfaces aid flange sealing and fitment
- Designed as a factory-style replacement so it does not provide performance gains
- Fitment must be confirmed for specific Scion xD engine year and trim before purchase
Verdict: A convenient, all-in-one factory-style replacement manifold kit built from ductile iron to reduce future warping and cracking.
3. SCITOO Front Catalytic Converter / Exhaust Manifold Fit for Mitsubishi Eclipse 2.4L (Direct Replacement)
| Position | Front |
|---|---|
| Fitment Type | Direct Replacement |
| Substrate Material | Ceramic |
| Restricted States | CA, NY, CO, ME |
| Material | Stainless Steel |
This SCITOO front catalytic converter is sold as a direct-fit replacement for 2.4L Mitsubishi Eclipse engines (and the listed Chrysler/Dodge twins). It combines a welded stainless steel manifold and EPA-compliant catalytic core with a ceramic substrate for emissions control. Installation is intended to be bolt-in when the vehicle and part selection match, making it suitable for DIYers with basic tools or an independent shop. The stainless construction and machined exterior promise corrosion resistance and longevity compared with painted cast pieces, and the product description emphasizes fitment validation and factory-style function. Some buyers report fitment alignment issues and the need for minor cutting, welding, or hardware swaps, so expect possible adjustments during installation. This unit is restricted in a few states, and it ships as a single front-piece assembly, so verify vehicle-specific legality and matching OEM part numbers before purchasing. For budget-focused repairs it offers an affordable path to restore emissions compliance while keeping replacement complexity lower than fabricating a custom system.
Best for: Budget-conscious owners seeking an affordable, factory-style replacement to restore emissions function on a 2.4L Mitsubishi Eclipse while minimizing parts cost and shop hours.
Less Ideal for: Enthusiasts wanting a performance-oriented header or those in restricted states who need a CARB-compliant part should look for certified alternatives or performance manifolds.
- Direct-replacement design intended for bolt-in installation when correct part is chosen
- Stainless steel construction for improved corrosion resistance
- EPA-compliant catalytic core with ceramic substrate for emissions control
- Machined exterior and welded assembly indicate solid build quality
- Some customers reported alignment and fitment issues requiring cutting, welding, or hardware changes
Verdict: A cost-effective, stainless-steel direct-replacement front catalytic converter designed to restore emissions function on 2.4L Mitsubishi Eclipse engines.
4. DNA MOTORING Factory-Style Catalytic Converter Assembly for 2006–2012 Mitsubishi Eclipse 2.4
| Position | Front |
|---|---|
| Model | OEM-CONV-012 |
| Manufacturer | DNA MOTORING |
| EPA Approval | Federal emissions models only |
This DNA MOTORING unit replaces the front catalytic converter/header on 2006–2012 Mitsubishi Eclipse 2.4 engines with a stainless steel, factory-style assembly that includes built-in catalysts and flanges for direct connection to the downpipe. It is intended for professional or experienced DIY installation and ships without installation instructions. The construction uses mandrel-bent stainless tubing and integrated catalyst material aimed at restoring emissions function and maintaining vehicle performance for federal-emissions models. In use it can be a cost-effective alternative to a factory part and several buyers report straightforward installs and working results. There are recurring fitment issues reported by some owners: heat shield alignment and upstream O2 sensor boss placement may not match the original exactly, and minor modification or an angled sensor bung can be required to complete installation. Expect added engine-bay heat compared with the OEM cast piece if the heat shield does not align, so plan for proper heat management during replacement.
Best for: Reliability-focused buyers who want a lower-cost, factory-style replacement to restore emissions compliance and running condition on a 2006–2012 Mitsubishi Eclipse 2.4 and are willing to manage installation carefully.
Less Ideal for: Buyers seeking an exact, bolt‑in replica of the OEM cast unit with original heat shielding and fitment should consider alternatives or factory parts instead.
- Designed as a factory-style direct replacement for 2006–2012 Mitsubishi Eclipse 2.4 front converter/header
- Mandrel-bent stainless steel construction intended for durability and improved flow
- Includes built-in catalyst material to restore emissions function for federal models
- Supplied with gaskets and studs/nuts for downpipe connection
- Heat shield alignment and O2 sensor boss location can differ from factory, sometimes requiring modification
- Does not include installation instructions and professional installation is recommended
Verdict: A cost-effective, factory-style stainless steel converter/header that restores emissions function on 2006–2012 Mitsubishi Eclipse 2.4s when fitment is managed carefully.
5. Auto Dynasty Front Dual Catalytic Converter Exhaust Manifold for Mitsubishi Eclipse 2.4L (2006–2012)
| Vehicle fit | Mitsubishi Eclipse 2006–2012 2.4L (Federal emissions only) |
|---|---|
| Construction | Stainless steel with ceramic catalyst |
| Features | Dual catalytic converter with oxygen sensor plug |
| Certification | EPA OBD-II approved |
This Auto Dynasty manifold replaces the front catalytic converter assembly on 2006–2012 Mitsubishi Eclipse 2.4L federal-emissions vehicles and is intended as a direct, drop-in replacement for a worn or rusted original. Constructed from stainless steel with mandrel bends and TIG welds, it houses dual catalytic converters and an oxygen sensor plug so it connects to the factory wiring and exhaust path without modification. Typical use is to restore emissions control and clear catalytic-related check-engine codes after a failing unit. The stainless construction and ceramic catalyst material aim to resist corrosion and provide long service life, while EPA OBD-II approval means it meets federal emissions requirements for non-California states. Important limitations are fitment restricted to federal-emissions 2.4L models and that it is not legal for sale or use in California, New York, or Maine emissions regions, so buyers in those states must choose a compliant unit; buyers may also need to check heat-shield fitment since some users report differences compared with the factory part.
Best for: Risk-averse mainstream buyers who prioritize a factory-style, emissions-compliant replacement to restore correct operation and avoid check-engine codes.
Less Ideal for: Owners in states with stricter emissions rules or buyers needing a California-compliant converter should look for region-specific, certified options instead.
- Direct factory-style replacement designed for 2006–2012 Eclipse 2.4L federal-emissions models
- Integrated oxygen sensor plug for straightforward connection to existing wiring
- Stainless steel construction with mandrel bends and TIG welds for corrosion resistance and strength
- EPA OBD-II approved for federal emissions compliance
- Not legal for sale or use in California, New York, or Maine emissions regions
- Heat shield or surrounding hardware may require adjustment due to slight differences from the original part
Verdict: A direct, stainless-steel factory-style catalytic converter manifold built to restore emissions function on federal-emissions Mitsubishi Eclipse 2.4L models.
Choosing the Right Mitsubishi Eclipse Exhaust Manifold: Key Factors to Consider
Fitment and Flange Geometry
Correct fitment is essential because the manifold must align precisely with the exhaust ports and bolt pattern on the Mitsubishi Eclipse head. Even small mismatches in flange flatness or hole spacing can cause exhaust leaks, noisy operation, and accelerated gasket wear.
Check whether the manifold was designed for your Eclipse model year and engine variant. Look for clear specifications on flange thickness, bolt pattern, and port alignment. A correctly shaped flange reduces installation time and lowers the chance of repeated removal for adjustments.
Material and Thermal Durability
Manifolds are exposed to intense heat and cycling, so material choice directly affects longevity. Cast iron is durable and resists warping, while certain steel alloys and ceramic-coated units offer lighter weight and improved heat management. Each option balances heat resistance, stiffness, and susceptibility to cracking.
Consider how the manifold manages heat near the head; materials that maintain dimensional stability help preserve a seal and limit stress on bolts and gaskets over time.
Sealing Design and Gasket Interface
A reliable sealing surface and compatible gasket interface are the primary defenses against exhaust leaks. Look for manifolds with smooth, flat mating surfaces and well-defined bolt bosses to ensure even clamp load distribution across the gasket.
Good designs reduce hotspot formation and avoid concentrated clamping forces that can crush or displace a gasket. Where possible, choose manifolds that specify compatible gasket types or include upgraded sealing features.
Mounting Hardware and Installation Practicality
Installation complexity affects both cost and the likelihood of a successful repair. Manifolds that work with commonly available studs, nuts, and gaskets make replacement easier. Consider whether the design requires removal of other components, special tools, or unusual torque sequences.
Accessible bolt locations and clear instructions reduce installation time and the risk of incorrect torquing that leads to leaks or broken studs. Also check for designs that simplify alignment during assembly.
Resistance to Cracking and Corrosion
Thermal stress and corrosion from exhaust gases and road conditions can cause cracks that lead to leaks. Evaluate whether the manifold's construction and surface treatments resist oxidation and stress concentrations that initiate cracks.
Coatings, thicker section design at stress points, and controlled cooling during manufacturing all help reduce the likelihood of cracking. A part that resists corrosion will also be easier to remove later if future service is needed.
Long-Term Serviceability and Parts Support
Consider how easy it will be to service or replace components related to the manifold in the future. Availability of replacement gaskets, studs, and compatible exhaust components affects lifecycle cost and downtime. Parts with common fastener sizes and readily available gaskets simplify future maintenance.
Good manufacturer documentation and clear specifications also make it easier to diagnose issues and obtain the correct replacement parts when required.
How We Chose the Best Mitsubishi Eclipse Exhaust Manifold
We prioritized parts that deliver reliable sealing and correct fitment to the Mitsubishi Eclipse engine flange, because a precise match reduces the risk of leaks and abnormal noise. Thermal durability was a core filter, with focus on materials and construction that resist warping and cracking under repeated heat cycles. We reviewed mounting design and flange flatness as separate criteria since poor geometry is a common cause of gasket failure. Ease of installation and compatibility with common vehicle hardware were assessed to minimize the risk of a difficult or unsafe fit. Long-term serviceability and availability of replacement gaskets or studs were also considered since repairability extends useful life.We excluded components that were not explicitly designed for the Mitsubishi Eclipse or that lacked clear specification on flange dimensions and bolt pattern. We also set aside manifolds with known reports of premature cracking or poor cast quality. The final list reflects parts that pass fitment checks, demonstrate robust thermal performance, offer solid sealing features, and are practical for routine installation and maintenance.
Our full evaluation process is outlined in our review methodology.
FAQ
What are common symptoms of a failing Mitsubishi Eclipse exhaust manifold?
Common symptoms include a loud ticking or tapping noise during acceleration, reduced engine performance, and a noticeable exhaust odor near the engine bay. You may also see soot or black deposits at the flange, which often indicate a sealing problem.
How can I diagnose an exhaust manifold leak on my Eclipse?
A visual inspection for soot, cracked castings, or loose bolts is a good first step. With the engine cold, check flange flatness and gasket condition. When safe, a brief engine run can reveal ticking noises that change with engine speed, which often suggests a leak near the manifold.
When should I replace the exhaust manifold gasket versus the manifold itself?
If the flange faces are flat and the manifold shows no cracks or severe warping, replacing the gasket and hardware can often restore a proper seal. If you find cracks, major corrosion, or warped flanges that prevent a tight fit, replacing the manifold is usually the more reliable solution.
Can a cracked exhaust manifold affect engine performance?
Yes. A cracked manifold can allow exhaust gases to escape before reaching the catalytic converter, which can alter backpressure, affect sensor readings, and reduce performance. It can also lead to louder operation and potential damage to nearby components from heat or exhaust leaks.
What should I expect during an exhaust manifold installation on an Eclipse?
Expect to work in a confined area with several bolts and gaskets to replace. Proper torque sequencing and use of anti-seize where appropriate help prevent future stud or bolt failure. In some cases you may need to replace hardware such as studs or nuts if they are corroded or damaged.
Conclusion
When choosing an exhaust manifold for a Mitsubishi Eclipse, prioritize correct fitment, a flat reliable flange, and material choices that resist thermal distortion and cracking. Good sealing design and accessible mounting hardware reduce the risk of future leaks and simplify maintenance.Balance durability against installation practicality and consider long-term parts support for gaskets and fasteners. Focusing on those key factors will help you choose a manifold that restores quiet operation, maintains engine efficiency, and minimizes repeat repairs.
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