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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 Reviewed A top-rated pick with lots of positive feedback | Dorman Driver Side Exhaust Manifold Kit with Gaskets and Hardware |  |
| Best Quality Built to a higher standard if you want something more solid | Dorman Exhaust Manifold Kit with Gaskets and Hardware (674-732) |  |
| Best Budget The cheapest option that still gets the job done reliably | AngyMeck Exhaust Manifold Pair with Gaskets and Hardware |  |
| Most Sold A high-volume bestseller chosen again and again | A-Premium Cast Iron Exhaust Manifold Kit with Gasket, Bolts and Heat Shield |  |
| Best Overall The best all-around choice for most situations | A-Premium Exhaust Manifold Kit with Gaskets and Hardware |  |
1. Dorman Driver Side Exhaust Manifold Kit with Gaskets and Hardware
| Material | Cast Iron |
|---|---|
| Bolt Pattern (Number of Holes) | 6 |
| Includes | Gaskets and downpipe hardware |
| Exterior | Painted |
This Dorman driver-side exhaust manifold is a cast-iron replacement kit designed to match the fit and function of the factory manifold and arrives with the gaskets and downpipe hardware needed for installation. It is typically used to replace a cracked or leaking manifold to restore exhaust sealing and reduce noise. The part is reverse-engineered for a close fit, painted for corrosion resistance, and supplied with the small components required for a one-box repair. In practice the manifold gives a near-factory fit and reliable long-term service when installed correctly, and multiple user reports note straightforward installation and improved cabin quietness. Expect to verify exact fitment before buying because bolt pattern and vehicle application must match. Some installers prefer higher‑quality one-piece gaskets and may need to source manifold bolts separately for older, corroded studs, so plan accordingly during replacement projects.
Best for: A reliability-focused buyer who prioritizes a durable, factory-quality replacement and wants a one-shipment repair solution to restore exhaust sealing and reduce cabin noise.
Less Ideal for: Buyers seeking a performance-oriented or lightweight aftermarket upgrade or those who need a direct fit for a vehicle not confirmed in the application list should look elsewhere.
- Includes necessary gaskets and downpipe hardware for a single-order repair
- Cast iron construction resists warping and cracking for long service life
- Painted finish adds corrosion resistance and longer durability
- Reverse-engineered to match factory fit for straightforward installation
- Supplied gaskets are multiple-piece and some installers prefer aftermarket one-piece gaskets
- Manifold bolts are not included which may require sourcing separately for older vehicles
Verdict A durable, factory-style replacement manifold that simplifies repairs by bundling gaskets and hardware, though installers may opt for aftermarket gaskets or separate bolts for older vehicles.
2. Dorman Exhaust Manifold Kit with Gaskets and Hardware (674-732)
| Installation Type | Bolt-On |
|---|---|
| Automotive Fit Type | Vehicle Specific Fit |
| Manufacturer | Dorman Products |
| Position | Center |
| Bolt Pattern (Number of Holes) | 7 |
This Dorman exhaust manifold kit is a complete direct-replacement assembly designed to repair a leaking or cracked passenger-side manifold. It ships with the manifold, gaskets, flange gaskets, studs, and nuts so you can perform a one-order repair without sourcing parts separately. Constructed from ductile iron and machined at the flange, the unit resists warping and cracking better than lower-grade cast parts, which helps keep exhaust leaks from reappearing under high-heat conditions. Typical use is a bolt-on replacement during a scheduled exhaust repair or when a leak or cracked manifold produces ticking or poor idle. Several buyers report minor fitment adjustments may be needed around sensors or brackets and that the supplied gasket and some fasteners are lower quality, so many technicians fit a higher-grade gasket and replacement bolts during installation. For performance-minded owners, the rugged material and complete kit reduce downtime and give a durable base for other exhaust upgrades, but the part may require light trimming or better fasteners for flawless, long-term service.
Best for: Performance-oriented owners who prioritize a durable, factory-replacement-quality manifold that withstands heat and stress and want a complete kit to minimize parts sourcing during repairs.
Less Ideal for: Buyers seeking a perfect plug-and-play, race-spec manifold with no adjustments or those who prefer a polished stainless performance header instead of a factory-style cast replacement.
- Complete kit includes manifold plus gaskets and basic hardware for a single-order repair
- Ductile iron construction reduces risk of warping and cracking compared with lower-grade cast parts
- Reverse-engineered for direct-fit installation to simplify replacement
- Machined flange surface improves sealing potential when paired with a quality gasket
- Included gaskets and some fasteners may be lower quality and often replaced during installation
- A few users needed minor grinding or trimming to clear nearby sensors or brackets
Verdict A rugged, complete replacement manifold that gives performance-focused owners a durable, out-of-the-box repair but often benefits from upgraded gaskets and fasteners for best results.
3. AngyMeck Exhaust Manifold Pair with Gaskets and Hardware
| Material | Cast Iron |
|---|---|
| Package Includes | Manifolds, manifold gasket, flange gasket, studs, nuts, springs |
| Manufacturer | AngyMeck |
| Manufacturer Part Number | AMN01129AN01165 |
These cast-iron exhaust manifolds are a budget-focused replacement option supplied as a left and right pair with gaskets, studs, nuts and springs. They are intended to replace cracked or leaking manifolds and restore a sealed exhaust path where the original cast manifolds have failed. In use the parts arrive ready to install and reviewers report decent fitment after checking part numbers and head faces; the included gaskets and flange hardware simplify a direct swap on compatible engines. Material is cast iron, so the pieces feel substantial and resist heat, but some buyers noted minor finish issues such as an undersized EGR passage that required drilling and the absence of manifold mounting bolts in some cases. This product is a practical, lower-cost route to stop exhaust leaks and get an older engine back to reliable running, but it is not a performance header and may need minor fitting or additional fasteners for a trouble-free install.
Best for: Budget-conscious buyers looking to replace leaking or cracked cast manifolds on an older vehicle with a low-cost, ready-to-install pair who prioritize cost and practical repair over performance improvements.
Less Ideal for: Anyone seeking a performance header, a perfect factory-original match for non-GM vehicles, or a plug-and-play solution for a Mitsubishi Eclipse should look at purpose-built parts instead.
- Sold as a complete left and right manifold pair with gaskets and mounting hardware included
- Cast iron construction provides heat resistance and durable sealing compared with cheaper thin-sheet options
- Multiple reviewers report good bolt-on fitment when matching part numbers and head surface preparation
- Designed for GM truck applications and not intended for fitment on Mitsubishi Eclipse engines
- May require minor modifications such as enlarging an EGR passage and users sometimes need to source additional mounting bolts separately
- Not a performance upgrade; primarily a direct replacement for worn or cracked factory manifolds
Verdict A low-cost, cast-iron replacement manifold pair that restores a sealed exhaust on compatible older GM trucks but is not suitable for Mitsubishi Eclipse fitment or performance upgrades.
4. A-Premium Cast Iron Exhaust Manifold Kit with Gasket, Bolts and Heat Shield
| Brand | A-Premium |
|---|---|
| Material | Cast Iron |
| Fitment Type | Direct Replacement |
| Includes | Manifold, gasket, flange hardware, springs, washers, heat shield |
This exhaust manifold kit supplies a cast iron manifold plus the common hardware needed for installation: a manifold gasket, flange hardware, springs, washers and a heat shield. It is intended as a direct replacement to restore exhaust routing and backpressure on compatible 1.8L engines. In real-world use the cast iron construction gives strength and good heat resistance, and several buyers report the part works well once fitted. Common issues in the field are alignment of the lower support bracket and uneven welds that sometimes require drilling or minor modification to match the factory mounting points. The included bolts and springs may not match factory lengths or grades so reuse of original fasteners or substitution with correct-grade hardware is often advisable. If you need a sturdy, budget-oriented replacement and are comfortable with light trimming or workshop adjustments, this kit can get the job done; if you want guaranteed bolt-for-bolt fitment with no tweaks, expect to consider a factory-quality alternative.
Best for: Risk-averse mainstream buyers looking for an affordable, straightforward replacement who prioritize restoring reliable exhaust function over perfect factory-fit aesthetics.
Less Ideal for: Drivers seeking a factory-exact, no-modification installation or a direct fit specifically engineered for Mitsubishi Eclipse models should consider a manufacturer-certified manifold or dealer-sourced replacement instead.
- Cast iron construction offers durability and high temperature resistance
- Includes gasket, bolts, springs, washers and heat shield so fewer extra parts are needed
- Sold as a complete kit to restore exhaust function without sourcing individual pieces
- Some units show misaligned support bracket or heat shield holes requiring drilling or modification
- Provided bolts and springs may not match factory grade or length and might need replacement
- Occasional welding defects reported that can require shop correction before installation
Verdict A budget-friendly cast iron manifold kit that restores exhaust function but may require minor trimming or hardware swaps for perfect fitment.
5. A-Premium Exhaust Manifold Kit with Gaskets and Hardware
| Brand | A-Premium |
|---|---|
| Manufacturer Part Number | APEMD116 |
| OEM Part Number | 674-940, 12609823 |
| Fitment Note | Compatible with L4 2.4L Sport Utility models (verify fitment) |
This A-Premium manifold kit is a direct-replacement style exhaust manifold sold with the intake and flange gaskets plus three bolts and three nuts to simplify installation. It is intended to restore a cracked or leaking manifold on compatible 2.4L engines and is typically used when the factory manifold has warped or developed exhaust leaks that cause noise, poor idle, or cabin fumes. The casting is solid and made to resist heat and corrosion, and several buyers report an accurate fit with no modification required. The included gaskets and basic fasteners remove the need to source small parts separately, which speeds up a home or shop repair. Limitations are that this is an aftermarket casting so surface blemishes can appear and long-term durability versus the original factory part is uncertain on engines known to stress manifolds; the kit also ships with only a minimal set of bolts and nuts which may not cover every repair preference. Keep in mind fitment must be verified for the vehicle before ordering.
Best for: Balanced buyers who want a ready-to-install replacement to fix exhaust leaks and restore normal engine operation without sourcing extra parts.
Less Ideal for: Those seeking a factory-quality OEM part or a heavy-duty performance upgrade should look elsewhere, as this is a standard aftermarket replacement rather than an enhanced or OEM-sourced manifold.
- Complete kit includes manifold, manifold and flange gaskets, plus bolts and nuts for a one-purchase repair
- Cast metal construction designed to resist heat and corrosion for functional longevity
- Multiple customer reports of accurate fit and straightforward installation without modification
- Aftermarket casting may show cosmetic blemishes not present on factory parts
- Limited fastener set may be insufficient for some repair scenarios
- Long-term durability compared to factory-quality manifolds on this engine is unknown
Verdict A practical, complete aftermarket manifold kit that makes a common 2.4L exhaust repair simple, but it is an aftermarket casting with uncertain long-term parity to factory parts.
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.
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.
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.
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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