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If you drive a Subaru Legacy, the right exhaust manifold affects engine performance, noise levels, and long-term reliability. You want a unit that fits correctly, manages heat well, and resists common failure modes so your engine runs smoothly and quietly. This guide highlights the top shortlisted exhaust manifolds selected specifically for the Subaru Legacy and explains why they made the list. We evaluated candidates on factors like exact fitment, thermal performance, build quality, and ease of installation. Read on to find options that balance durability and practicality for regular driving or a high-mileage restoration.
Looking for other parts? See all Subaru Legacy parts & accessories.
Top Picks at a Glance
| Best Reviewed A top-rated pick with lots of positive feedback | Subaru Exhaust Manifold Stud & Nut Kit (Genuine Subaru) |  |
| Best Quality Built to a higher standard if you want something more solid | Dorman 674-522 Driver Side Exhaust Manifold Kit (includes gaskets and hardware) |  |
| Best Budget The cheapest option that still gets the job done reliably | DNJ EG706 Exhaust Manifold Gasket Set |  |
| Most Sold A high-volume bestseller chosen again and again | Subaru Genuine Exhaust Manifold & Catalytic Converter Gasket Kit |  |
| Best Value for Money The sweet spot between price and what you get | Subaru Genuine Turbo Exhaust Gasket Kit (44022AA150Skt) |  |
| Best Overall The best all-around choice for most situations | BRGMAX Exhaust Manifold Gasket Kit for Subaru Single-Turbo EJ Engines |  |
1. Subaru Exhaust Manifold Stud & Nut Kit (Genuine Subaru)
| Manufacturer | Subaru |
|---|---|
| Manufacturer Part Number | 800910550KIT |
| Included Parts | Stud 800910550 x6, Nut 902370029 x6 |
This genuine Subaru stud and nut kit supplies six studs (800910550) and six nuts (902370029) intended for pipe-to-head fastening on Subaru exhaust manifolds. It is typically used when replacing a corroded or damaged manifold or when fitting new headers during a rebuild, and the factory-match parts simplify installation by matching factory threads and fitment. Buyers will appreciate the OEM fit and finish that reduce the risk of cross-threading and ensure proper torqueing compared with unknown aftermarket fasteners. The kit is small and focused, so it does not include gaskets or other hardware; expect to source those separately. Because these are factory replacement fasteners, they restore correct factory clamping and provide peace of mind on long-term reliability, but the kit covers only the studs and nuts needed for one side of a manifold assembly and is not a complete manifold repair kit.
Best for: Reliability-focused buyers who prioritize factory-match parts and want peace of mind when replacing exhaust manifold fasteners on a Subaru Legacy during maintenance or header installation.
Less Ideal for: Buyers looking for a complete exhaust repair kit with gaskets, bolts for other components, or those who prefer bulk aftermarket fasteners for high-volume shop use.
- Genuine Subaru parts ensure factory-quality fit and thread compatibility
- Includes the exact studs and nuts used by the manufacturer to avoid fitment guesswork
- Helps prevent cross-threading and makes torqueing predictable during manifold or header installs
- Compact kit is easy to carry and use during a rebuild or exhaust repair
- Contains only studs and nuts so gaskets and other fasteners must be purchased separately
- Kit quantity covers one set of fasteners and may not be sufficient for larger repairs requiring extras
Verdict If you want factory-match fasteners to restore correct exhaust manifold clamping on a Legacy, this genuine Subaru stud and nut kit is a simple, reliable choice.
2. Dorman 674-522 Driver Side Exhaust Manifold Kit (includes gaskets and hardware)
| Material | Cast Iron |
|---|---|
| Bolt Pattern (Number of Holes) | 6 |
| Manufacturer | Dorman Products |
This Dorman kit supplies a driver-side exhaust manifold built from ductile cast iron and bundled with the gaskets, studs, and nuts needed to complete a single-side repair. It is intended as a factory-style replacement and is reverse-engineered to match original mounting points, which makes it useful when replacing a warped or cracked Subaru Legacy manifold of the same configuration. Typical use is a direct swap during a head or exhaust repair where you want a durable, heat-resistant component; the cast iron construction reduces the chance of future cracking compared with thinner materials. The included gaskets and hardware save a trip to the parts store and speed up installation. Potential limitations are fitment differences across Legacy model years and engine variants, so verify compatibility with your exact year and engine before buying, and some installers have reported tight clearances near sensors that may require trimming or careful handling. If your build demands the strongest, factory-style replacement for long-term durability, this kit delivers that benefit.
Best for: Performance-oriented buyers who prioritize long-term durability and a factory-style replacement when repairing a Subaru Legacy manifold and want a solution that reduces repeat failures.
Less Ideal for: Buyers looking for a lighter weight or performance-tuned aftermarket header, or those who prefer a universal or multi-vehicle part instead of a vehicle-specific replacement.
- Ductile cast iron construction resists warping and cracking under heat.
- Includes manifold gasket, flange gasket, studs and nuts for a one-box repair.
- Reverse-engineered to match factory mounting points for easier installation.
- Machined exterior for consistent sealing surfaces.
- May interfere with nearby sensors or require minor trimming on some installations.
- Fitment can vary across model years and engine variants so compatibility must be confirmed.
Verdict A durable, cast-iron, direct-fit replacement kit that gives a Subaru Legacy owner a factory-style, long-lasting repair with the convenience of included gaskets and hardware.
3. DNJ EG706 Exhaust Manifold Gasket Set
| Part Number | EG706 |
|---|---|
| Fits Engines | FA20, FA20D, FB25BA, FB20, FB25, EJ257, EJ255, EJ253, EJ251, EJ222, EJ25D, EJ22EZ |
| Condition | New |
| Warranty | 12 months or 12,000 miles limited |
The DNJ EG706 is a basic replacement exhaust manifold gasket set intended for common Subaru four‑cylinder engines. It installs between the exhaust manifold and the cylinder head to seal exhaust ports and prevent leaks that cause noise, poor idle, or decreased efficiency. Typical use is as a direct factory‑style replacement during manifold removal for repairs, header swaps, or when correcting an existing leak. The product lists broad engine compatibility including FA and EJ family designations used in many Subaru models, and it comes with a limited 12‑month/12,000‑mile warranty covering defective parts. For a budget repair this gasket set provides a quick way to restore a proper exhaust seal without upgrading to specialty materials. Limitations are that it is a basic replacement part with no stated premium coatings or multilayer steel construction, so longevity versus higher‑end gaskets may be shorter under high‑heat or high‑boost use and it requires correct torque and surface preparation to avoid re‑leakage.
Best for: Budget-conscious owners looking for an affordable, factory-style exhaust gasket to fix leaks or replace a worn seal during routine exhaust or manifold service on a Subaru Legacy.
Less Ideal for: Drivers planning high-boost, turbo upgrade, or performance header installations who need heavy‑duty or specialty gaskets for sustained high temperatures and pressure.
- Designed to match factory gasket form for straightforward replacement during manifold service
- Covers a wide range of Subaru FA and EJ four‑cylinder engine designations for compatibility with many Legacy engines
- Backed by a 12‑month or 12,000‑mile limited warranty for basic defect protection
- No specification of multilayer steel or heat‑resistant coatings, so may not match longevity of premium gaskets under extreme conditions
- Limited warranty covers replacement only and not labor or related repairs
Verdict A cost‑effective factory‑style gasket set for fixing exhaust leaks on Subaru Legacy four‑cylinder engines, but not the best choice for high‑stress performance use.
4. Subaru Genuine Exhaust Manifold & Catalytic Converter Gasket Kit
| Manufacturer | Subaru |
|---|---|
| Fits Engines | EJ253 EJ25i 2.5 SOHC non turbo |
| Fitment Years | 2005-2012 Legacy/Outback, 2006-2011 Impreza, 2006-2010 Forester |
| Included Parts | Triangle exhaust gasket x1, head pipe gaskets x2 |
This genuine Subaru gasket kit replaces the exhaust manifold to catalytic converter sealing components on non-turbo 2.5 SOHC Subaru engines. The kit includes one triangle exhaust gasket and two head pipe gaskets intended for use when replacing or resealing the manifold, catalytic converter, or front pipe assemblies on Legacy, Outback, Impreza, and Forester models listed. Using factory replacement gaskets reduces the chance of exhaust leaks and makes getting correct fitment simpler than selecting aftermarket alternatives. Practical benefits include sealed OEM packaging and parts matched to Subaru mating surfaces so installation aligns with factory bolt patterns. Limitations are that the kit only covers gaskets and not studs, bolts, or the converter itself, so a more comprehensive repair may require additional fasteners or parts if hardware is corroded or damaged.
Best for: A risk-averse mainstream buyer who prioritizes factory-spec replacements and wants a straightforward, reliable gasket set for routine exhaust manifold-to-converter repairs on compatible Subaru Legacy-focused vehicles.
Less Ideal for: Buyers needing a full exhaust repair kit including fasteners, studs, or a catalytic converter, or those working on turbocharged or non-listed engine variants should look elsewhere.
- Genuine Subaru gaskets matched to factory mating surfaces for correct fitment
- Includes both triangle exhaust gasket and two head pipe gaskets needed for a typical front exhaust reseal
- Packaged as OEM sealed items to reduce risk of damaged or incorrect parts
- Specifically listed to fit common non-turbo 2.5 SOHC Subaru engines and model years for straightforward selection
- Kit includes only gaskets and does not supply studs, bolts, or catalytic converter hardware that may be needed during a repair
- Not compatible with turbocharged or other engine variants of the same model years
Verdict Choose this factory Subaru gasket kit when you want a straightforward, factory-matched replacement for sealing the exhaust manifold to the catalytic converter on non-turbo 2.5 SOHC Subaru models.
5. Subaru Genuine Turbo Exhaust Gasket Kit (44022AA150Skt)
| Manufacturer | SUBARU |
|---|---|
| Manufacturer Part Number | 44022aa150skt |
| Fits | 1992–2014 Subaru turbo models (Outback, Legacy, Impreza, WRX, STI, Forester) |
This is a factory-quality gasket kit intended to replace the critical seals around a Subaru turbo and its exhaust piping. It includes the turbo gasket, up-pipe and down-pipe gaskets, and two exhaust gaskets supplied in Subaru-sealed packaging for a like-for-like replacement during turbo, manifold, or exhaust work. Installers will use it when removing or reinstalling the turbo, replacing a leaking joint, or doing a manifold swap; using genuine gaskets reduces the risk of exhaust leaks and simplifies getting factory fitment and bolt-hole alignment. The practical benefit is confidence in compatibility with Subaru turbo hardware and fewer parts to source separately. Limitations are that the kit only contains the listed gaskets so flange or other exhaust hardware gaskets may be needed separately, and it does not include hardware or exhaust studs, so additional parts may be required for a full repair. For routine turbo service or manifold replacement on supported Subaru models this kit covers the main sealing points without aftermarket variations.
Best for: A practical optimizer who wants straightforward, factory-quality replacement parts to complete turbo or manifold work on a Subaru with minimal sourcing hassle.
Less Ideal for: Someone doing a complete exhaust overhaul who wants a full hardware kit or additional flange gaskets included should look for a more comprehensive repair kit.
- Contains genuine Subaru-sealed OEM gaskets for turbo, up pipe, down pipe, and exhaust flange joints
- Simplifies repairs by providing the common gasket set needed for turbo or manifold removal and reinstallation
- Factory fitment reduces fussing with fit and alignment compared with generic aftermarket gaskets
- Does not include exhaust studs, bolts, or any hardware needed for installation
- Does not contain every possible flange gasket used elsewhere in the exhaust system so additional gaskets may be required
Verdict An OEM Subaru gasket kit that removes guesswork for turbo or manifold service on supported Subaru turbocar models but does not include installation hardware.
6. BRGMAX Exhaust Manifold Gasket Kit for Subaru Single-Turbo EJ Engines
| Fits for | 1991-2019 single-turbo EJ motors (listed EJ20/25 variants) |
|---|---|
| Package includes | Exhaust manifold gasket (2), up pipe to turbo gasket, up pipe gasket, down pipe gasket |
| Manufacturer | BRGMAX |
This kit supplies the exhaust manifold gasket plus three up/down-pipe gaskets needed when servicing the turbo exhaust on single-turbo Subaru EJ engines. It is typically used during manifold removal, turbo swaps, or when repairing exhaust leaks between the manifold, up pipe, and down pipe. The set lists the factory part references and covers a wide range of Subaru Legacy, WRX, STI, Forester XT and Outback XT years with EJ20 and EJ25 variants, so it simplifies parts sourcing for a full exhaust joint refresh. Reviewers report multi-layer steel construction and a fit that seals reliably when torqued to spec, giving good value compared with dealer parts. Some users however found inconsistent sealing on imperfect flanges and preferred factory gaskets for repeatability, so check flange flatness before installing. The kit is a practical option for a balanced buyer who wants a complete gasket set for a turbo exhaust service without buying individual dealer pieces.
Best for: A balanced all-round buyer who wants a single, budget-conscious kit to replace all turbo exhaust gaskets during a manifold or turbo service on Subaru Legacy single-turbo EJ engines.
Less Ideal for: Owners seeking guaranteed factory-identical parts for repeated high-boost or heavily modified engines should consider manufacturer-sourced gaskets instead.
- Complete kit includes exhaust manifold gasket plus up-pipe and down-pipe gaskets for a full exhaust joint service
- Lists factory part numbers so you can verify fitment for single-turbo EJ engines
- Multi-layer steel construction reported to seal well when installed and torqued correctly
- Covers many Subaru Legacy, WRX/STI, Forester XT and Outback XT model years, reducing parts hunting
- Some users experienced sealing failures on non-flat flanges and reverted to factory gaskets
- Not guaranteed to match OEM material tolerances in all samples
Verdict A cost-effective, full exhaust gasket set for Subaru single-turbo EJ engines that offers broad fitment and good sealing in most installations but may not replace OEM in every case.
Choosing the Right Subaru Legacy Exhaust Manifold: Key Factors to Consider
Fitment and Bolt Pattern
Correct fitment is the most important consideration because misaligned flanges or incorrect bolt patterns lead to installation headaches and exhaust leaks. Check that the manifold matches the Subaru Legacy exhaust ports, mounting points, and sensor locations so you do not need to modify studs, spacers, or the exhaust routing.
A manifold that matches OEM mating surfaces reduces the chance of gasket failure and makes it easier to reuse existing hardware. If you plan to swap exhaust manifold parts, confirming flange thickness and port spacing helps ensure a solid seal and consistent exhaust flow.
Material and Coating
Materials such as cast iron, stainless steel, or coated mild steel differ in heat tolerance, corrosion resistance, and susceptibility to cracking. Cast iron is often sturdy and resists thermal stress, while stainless variants can offer better corrosion resistance and lighter weight.
Protective coatings or thermal wraps can reduce surface temperature and slow corrosion, but coatings vary in durability. Consider the climate you drive in and whether road salt or moisture exposure could accelerate corrosion when choosing materials and finishes.
Thermal Management
How the manifold handles heat affects engine bay temperatures, component life, and the risk of warping or cracking. Designs that promote even heat distribution and include provisions for heat shielding can protect nearby components and reduce under-hood temperatures.
Good thermal management also reduces the likelihood of gasket failure and can stabilize exhaust gas temperatures, which helps sensors read more predictably. If you do a lot of spirited driving or towing, prioritize manifolds that tolerate higher sustained temperatures without degradation.
Sealing and Gasket Interface
A reliable seal at the flange is critical to avoid exhaust manifold symptoms such as ticking noises, loss of power, or exhaust odor in the cabin. Look for manifolds that provide accurate mating surfaces and include provisions for high-quality gaskets that match the port geometry.
Some designs use integrated flanges or captive fasteners to simplify alignment during installation. Proper sealing reduces the chance of leaks that can accelerate wear on downstream components or trigger sensor-related issues.
Durability and Common Failure Modes
Consider how the manifold design mitigates typical failure modes like cracking near stress points, flange warping, or stud pull-through. Reinforced transition areas, thicker flange sections, and smooth internal geometry can all contribute to longer service life.
Evaluate whether the design facilitates spot welding, reinforcement ribs, or other features that address known weak points. For a vehicle that accumulates high mileage, prioritize long-term durability over marginal short-term gains.
Ease of Installation and Serviceability
A manifold that is straightforward to install saves time and reduces the chance of installation errors. Features that help include pre-drilled mounting holes that match factory locations, clear sensor bosses, and compatibility with existing heat shields or brackets.
Also consider access for future diagnostics and repairs. A design that allows easy inspection of gaskets and quick removal without disturbing unrelated components will simplify maintenance and lower labor complexity.
FAQ
What are common exhaust manifold symptoms on a Subaru Legacy?
Common symptoms often include a ticking or tapping noise during cold starts that may change with engine speed, a noticeable decrease in engine smoothness or power, and sometimes a strong exhaust smell near the engine. These issues usually depend on the size and location of any leak and how the manifold interfaces with the exhaust ports.
How can I diagnose an exhaust manifold leak safely?
You can often detect a leak by listening for changes in exhaust noise while the engine is idling and then revving gently. A visual inspection for soot around flange seams and gasket areas is helpful. For more certainty, a smoke test or using a handheld stethoscope near the manifold while an assistant revs the engine can pinpoint leak locations.
When should I replace the exhaust manifold gasket versus the whole manifold?
If the sealing surface and flange are intact and only the gasket shows signs of failure, replacing the gasket alone can resolve leaks. However, if the flange is warped, cracked, or corroded so it cannot form a good seal, the entire manifold should be replaced to avoid recurring issues.
Does material choice affect how often a manifold cracks?
Yes, material and design both influence cracking frequency. Heavier, more heat-tolerant materials and designs that minimize stress concentrations usually resist cracking better. Environmental factors and how the vehicle is driven also play a significant role in longevity.
Will swapping an aftermarket manifold affect engine sensors or performance?
An aftermarket manifold that maintains correct port geometry and sensor boss locations usually preserves sensor function and general performance. Deviations in flow characteristics or sensor placement can alter exhaust gas behavior, which is why maintaining proper fitment and sensor locations is important.
How difficult is exhaust manifold installation on a Subaru Legacy?
Installation difficulty varies with engine layout and access, but many replacements are moderately challenging and require basic mechanical skills and common tools. Expect to work in a confined space and to follow torque specs and sequence for fasteners to ensure a good seal. In some cases, removing surrounding components improves access.
How We Chose the Best Subaru Legacy Exhaust Manifold
We focused on choices that offer reliable fitment and thermal control for the Subaru Legacy platform. Primary filters included flange alignment and bolt pattern accuracy to avoid fitment issues, material and coating choices that affect heat resistance and corrosion protection, and flow characteristics that influence backpressure and engine response. We also considered manufacturing tolerances, mounting hardware quality, and design features that reduce common stress points that lead to cracks or warping. Candidates were excluded if they required extensive modification to the exhaust system or engine bay, lacked clear fitment specifications for the Subaru Legacy, or used substandard materials prone to premature failure. We prioritized parts that simplify installation, minimize gasket sealing problems, and are likely to perform well under typical driving conditions. Finally, we weighed serviceability and how the design affects diagnostics for leaks and related failures.
Our full evaluation process is outlined in our review methodology.
Conclusion
Choosing the right exhaust manifold for a Subaru Legacy means prioritizing proper fitment, durable materials, and good thermal management. These elements reduce the risk of leaks, cracking, and repeated service calls while supporting consistent engine performance. Weigh the tradeoffs between long-term durability and installation complexity, and give extra attention to flange sealing and gasket quality. A well-chosen manifold eases diagnostics and helps keep exhaust-related symptoms from affecting drivability.
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