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Replacing gaskets on your Subaru Impreza is one of the most effective ways to stop leaks and restore engine reliability. Choosing the right gasket set matters because poor fit or inferior materials can lead to repeat leaks, difficult installs, or premature failure. This guide covers seven shortlisted Subaru Impreza engine gasket set options that meet common repair needs.We evaluated each pick against sealing material, fitment accuracy, and kit completeness so you can find the right option for routine maintenance or a full engine rebuild. Read on to compare how the options differ in coverage and construction before the product list.
Looking for other parts? See all Subaru Impreza parts & accessories.
Top Picks at a Glance
| Best overall The best all-around choice for most situations | Fel-Pro HS 26415 PT-1 Head Gasket Set for Subaru |  |
| Best quality Built to a higher standard if you want something more solid | Fel-Pro HS 26531 PT Head Gasket Set for Subaru WRX STI |  |
| Best Value The sweet spot between price and what you get | KAX Engine Cylinder Head Gasket Set for Subaru 2.5L (MLS kit) |  |
| Best Budget The cheapest option that still gets the job done reliably | KAX HS 26415 PT-1 Cylinder Head Gasket Set for 2.5L Subaru (Fitment: Forester, Impreza, Outback, Legacy, Baja, Saab 9-2X) |  |
| Highest Rated A top-rated pick with lots of positive feedback | Genuine Subaru MLS Head Gasket Kit for 2.5 SOHC Non-Turbo |  |
| Most popular A crowd favorite that many people choose with confidence | JAVOUKA Head Gasket Set for 2.5L Subaru EJ251/EJ253 (Fits Impreza/Outback/Forester/Legacy/Baja) |  |
1. Fel-Pro HS 26415 PT-1 Head Gasket Set for Subaru
| Brand | Fel-Pro |
|---|---|
| Material | Stainless Steel |
| Model | Head Gasket Set |
| Manufacturer Part Number | HS26415PT1 |
This Fel-Pro head gasket set supplies the head gaskets and numerous related seals needed when rebuilding or repairing a Subaru Impreza engine. It is multi-layer stainless steel with embossed sealing beads and a proprietary coating designed to tolerate imperfect sealing surfaces, which makes it useful when heads are resurfaced rather than perfectly flat. Typical use is during a head gasket replacement or full top-end rebuild; the kit includes intake, exhaust and valve-cover gaskets so you do not have to source multiple pieces separately. The MLS construction and combustion sealing features aim to cope with head lift and high cylinder pressures common to Subaru boxer engines, and many users report reliable, leak-free service when installation and head preparation are done correctly. Limitations are that it is a replacement kit that still requires proper head resurfacing and correct torque sequence to perform, and the kit may include more parts than an installer needs while missing small dealer-only O-rings in some cases.
Best for: Buyers seeking a balanced, reliable factory-replacement style gasket set for a Subaru Impreza top-end repair who value complete kits and proven materials over aftermarket tricks.
Less Ideal for: If you want a one-piece performance upgrade for extreme motorsport builds or need dealer-sourced minor O-rings included, this standard repair kit may not meet that need.
- Multi-layer stainless steel construction built to handle head lift and high cylinder pressures.
- Embossed sealing beads and a proprietary coating help seal imperfect or resurfaced head surfaces.
- Comprehensive kit includes head gaskets plus many intake, exhaust and valve-cover gaskets to simplify a top-end rebuild.
- Designed specifically for the Subaru applications listed, reducing fitment guesswork for the Impreza models covered.
- Does not include certain small dealer-only O-rings some builders still source separately.
- Performance depends on proper head resurfacing and following bolt torque and angle procedures; the gasket cannot correct major machining or assembly mistakes.
Verdict: A complete, factory-style MLS head gasket kit that balances durability and convenience for Subaru Impreza top-end repairs.
2. Fel-Pro HS 26531 PT Head Gasket Set for Subaru WRX STI
| Brand | Fel-Pro |
|---|---|
| Material | Stainless Steel |
| Model | HEAD GASKET SET |
This Fel-Pro HS 26531 PT head gasket set is built for high-pressure Subaru applications and is intended as a factory-quality replacement when rebuilding or repairing a WRX STI cylinder head. It uses multi-layer stainless steel construction with embossed sealing beads and a proprietary coating to tolerate rougher deck finishes and head lift, which helps maintain combustion sealing under elevated cylinder pressures. In practice you would use this gasket during head removal and reinstallation or as part of a full engine rebuild where reliable sealing and durability matter. The design emphasizes sealing on imperfect surfaces and repeated thermal cycling, which is useful for performance engines that see higher boost and temperature swings. Limitations are that it is a direct part replacement without installation hardware or head bolts included, and proper surface prep and torque procedures remain critical for success. For performance-focused Subaru repairs this set provides a robust sealing solution but it still depends on correct machine work and installation to deliver long-term reliability.
Best for: Performance-oriented Subaru owners focused on reliable, factory-quality cylinder sealing during engine rebuilds or head work who prioritize durability under boost and higher operating stresses.
Less Ideal for: Drivers looking for a simple do-it-yourself slip-in repair without machine work or those who need a complete installation kit with bolts and gaskets included.
- Multi-layer stainless steel construction resists head lift and maintains sealing stress
- Embossed sealing beads at critical areas reduce leak paths around combustion and coolant passages
- Proprietary coating tolerates rougher sealing surfaces up to 80 Ra, reducing need for ultra-fine finishes
- Engineered specifically for Subaru performance engines to handle higher cylinder pressures
- Does not include installation hardware such as head bolts or washers
- Requires correct surface preparation and machining for reliable long-term sealing
Verdict: A durable, multi-layer stainless steel head gasket set made to seal high-pressure Subaru engines when paired with proper surface prep and installation.
3. KAX Engine Cylinder Head Gasket Set for Subaru 2.5L (MLS kit)
| Compatible engines | Subaru 2.5L (listed fitment 1999–2005) |
|---|
This KAX head gasket kit is a full multi-layer steel (MLS) replacement package intended for Subaru 2.5L engines and comes with the head gasket plus intake, exhaust, valve cover gaskets, valve stem seals, O-rings and other seals so you have everything needed for a head service. It is built from MLS stainless steel and graphite composite and is rated to withstand high temperatures and elevated cylinder pressures, which helps maintain a long-lasting seal when the engine is rebuilt or repaired. For DIY mechanics or independent shops working on Subaru Impreza 2.5L engines, the kit simplifies parts sourcing and reduces the risk of missing components during reassembly. The main compromises are that this is an aftermarket kit rather than a factory brand part and correct installation and head surface preparation remain critical to prevent leaks. Fitment must be verified for the specific model year and engine; if precise OEM match is required some buyers may prefer a factory-brand gasket set.
Best for: Practical optimizers who want a single, cost-effective parts kit to complete a Subaru Impreza 2.5L head service without sourcing multiple suppliers; ideal for hands-on DIYers and independent shops aiming to keep repair time and parts mismatches low.
Less Ideal for: Buyers seeking a Subaru factory-branded gasket set or those wanting a plug-and-play warranty-backed OEM replacement should consider factory-sourced parts instead.
- Complete kit includes head gasket plus intake, exhaust, valve cover gaskets and seals to avoid sourcing separate parts
- Multi-layer steel with graphite composite construction designed for high temperature and pressure resistance
- Labeled components and a full parts set reduce installation delays and compatibility issues
- Saves cost versus buying individual gaskets by providing necessary components together
- Aftermarket product rather than a Subaru factory-branded replacement
- Successful long-term sealing depends on correct installation and cylinder head condition, which the kit does not address
Verdict: A cost-conscious, all-in-one MLS gasket kit that simplifies Subaru 2.5L head repairs but requires correct installation and head preparation for reliable long-term sealing.
4. KAX HS 26415 PT-1 Cylinder Head Gasket Set for 2.5L Subaru (Fitment: Forester, Impreza, Outback, Legacy, Baja, Saab 9-2X)
| Fitment | Subaru 2.5L: Forester 2006-2010, Impreza 2006-2011, Outback 2006-2009, Legacy 2006-2009, Baja 2006, Saab 9-2X 2006 |
|---|---|
| Included parts | MLS Head Gasket x2, Exhaust Gasket x2, Intake Gasket x2, Valve Cover Gasket x2, Oil Pan Gasket x1, plus multiple seals |
| Materials | 201/319 stainless steel, MLS metal, flexible graphite, RTV silicone |
This KAX head gasket set supplies the main MLS head gaskets plus intake, exhaust, valve cover, oil pan gaskets and a wide assortment of smaller seals needed for a full head service on Subaru 2.5L engines. It is intended as a direct-fit replacement for mid-2000s Impreza, Forester, Outback, Legacy, Baja and compatible Saab 9-2X models and is packaged so most installers will have every small gasket and seal on hand without scavenging parts. The kit uses multi-layer steel, flexible graphite and RTV components intended to resist heat, pressure and corrosion typical of an overhead cam boxer engine. For budget-focused repairs this gives the convenience of one-purchase completeness and labeled parts that speed reassembly. Expect factory-replacement-style fitment but be mindful that long-term durability depends on proper installation, surface prep, and torque procedures; this kit does not include head resurfacing or machine work that may be required on worn heads.
Best for: Budget-conscious DIYers or independent shops doing a full head gasket replacement on mid-2000s Subaru 2.5L engines who prioritize value and a single-kit solution to avoid sourcing multiple parts.
Less Ideal for: Owners seeking a premium OEM-branded gasket set or those whose heads need machining and inspection would be better served by purchasing professional machine work and specifying upgraded parts separately.
- Complete kit includes MLS head gaskets plus intake, exhaust, valve cover, oil pan gaskets and numerous small seals
- Materials listed (MLS, stainless, flexible graphite, RTV) target good resistance to heat and pressure
- Marketed as direct-fit for Subaru 2.5L mid-2000s engines which simplifies parts matching for repairs
- Labeled components and wide assortment of seals reduce the chance of missing parts during a rebuild
- Long-term durability depends on correct installation and head condition; kit does not address machining or resurfacing needs
- Some components are generic fitments and may require careful verification against the vehicle during install
Verdict: A value-oriented, all-in-one head gasket kit that supplies the parts needed to complete a Subaru 2.5L head service without hunting for missing gaskets.
5. Genuine Subaru MLS Head Gasket Kit for 2.5 SOHC Non-Turbo
| Brand Name | GENUINE SUBARU |
|---|---|
| Part Number | 11044AA642S |
| Material Type | Steel |
This Genuine Subaru head gasket kit supplies factory-quality multi-layer steel head gaskets and the additional intake, exhaust, cam, and crank seals needed when servicing 2.5 SOHC non-turbo Subaru engines. It is intended for a full head gasket job on compatible Impreza, Forester, Outback, Legacy, and Baja models from the covered years and comes as an OEM sealed kit to simplify sourcing parts. The multi-layer steel head gaskets are an upgrade replacement compared with older single-layer pieces and are more resistant to combustion leak and longevity issues when installed and torqued to spec. Including exhaust and intake gaskets plus cam and crank seals reduces the chance of missing components during a teardown, which is helpful for a reliable repair. Limitations are that fitment is specific to non-turbo SOHC 2.5 engines and this kit does not include rocker cover gaskets, so you may need those separately depending on your job.
Best for: Reliability-focused DIYers or shop technicians who prioritize factory-quality replacements and want a complete OEM kit to address head gasket failures on non-turbo 2.5 Subaru engines.
Less Ideal for: Buyers looking for parts for turbocharged Subaru engines or those who need a parts bundle that includes rocker cover gaskets and additional valve-train seals.
- Genuine Subaru OEM parts ensure factory-spec fit and finish
- Multi-layer steel head gaskets improve sealing and durability versus older single-layer designs
- Kit includes intake, exhaust gaskets and cam and crank seals to support a complete head gasket service
- Packaged as OEM sealed items to reduce the risk of missing or mismatched components
- Compatible only with 2.5 SOHC non-turbo Subaru engines, not for turbo models
- Does not include rocker cover gaskets which may be needed for a full valve-cover service
Verdict: Choose this Genuine Subaru MLS head gasket kit when you want factory-quality gaskets and seals for a reliable long-term repair on 2.5 SOHC non-turbo Subaru engines.
6. JAVOUKA Head Gasket Set for 2.5L Subaru EJ251/EJ253 (Fits Impreza/Outback/Forester/Legacy/Baja)
| Compatible Engines | 2.5L EJ251 EJ253 |
|---|---|
| Compatible Models | Subaru Impreza/Outback/Forester/Legacy/Baja |
| Gasket Type | Multi layer steel (MLS) |
This JAVOUKA head gasket set provides a complete MLS head gasket and accompanying seals intended for 2.5L Subaru EJ251/EJ253 engines used in Impreza, Outback, Forester, Legacy and Baja models. It is typically used when replacing a blown or leaking head gasket or during a head job; the multi-layer steel construction is meant to hold up to thermal cycling and maintain a reliable seal. The kit includes the head gasket and the usual ancillary gaskets so you can do the job in one purchase rather than hunting for individual pieces. Practical benefits include compatibility across the listed Subaru models and an aftermarket option that aims to match factory fitment for a straightforward installation by a competent technician. Limitations are that the kit does not include installation instructions and professional installation is recommended, and as with many aftermarket gasket sets long-term durability can depend on correct surface preparation and torque procedures rather than the kit alone.
Best for: Convenience-driven owners who want a single, ready-made gasket kit to replace a leaking head gasket on a Subaru 2.5L engine and prefer buying a matched set to avoid multiple parts orders.
Less Ideal for: Shoppers looking for a DIY kit with detailed instructions or those who prefer OEM-branded parts and documented factory support should consider other options.
- Multi-layer steel (MLS) head gasket designed for improved durability under thermal cycling
- Complete gasket kit includes head gasket and associated seals so you get necessary pieces in one purchase
- Specifically listed to fit Subaru 2.5L EJ251/EJ253 engines across multiple model years
- Positive user feedback reporting good fitment and functionality
- No installation instructions included, so novices will need professional help or a repair manual
- Long-term durability depends heavily on correct head surface prep and torque procedure rather than the kit alone
Verdict: A convenient, full MLS head gasket kit for Subaru 2.5L EJ251/EJ253 engines that simplifies parts sourcing but requires professional-level installation for best results.
Choosing the Right Subaru Impreza Engine Gasket Set: Key Factors to Consider
Material and Construction
Gasket material and construction directly affect durability and sealing performance. Multi-layer steel and high-temperature composite materials behave differently under heat and pressure; MLS gaskets often offer superior combustion sealing for cylinder heads, while composite materials can provide better conformity for irregular surfaces.
Consider how materials respond to thermal cycling, oil exposure, and coolant. Materials that resist compression set and maintain a tight seal across varying temperatures reduce the chance of repeat failures. Also look for reinforced areas at high-stress openings, such as around combustion chambers and coolant passages, to avoid blowouts.
Fitment Accuracy
Accurate fit is essential to a straightforward installation and long-term leak prevention. Gaskets must align with bolt holes, oil and coolant passages, and sealing surfaces precisely; even small misalignments can create gaps or require rework.
Choose kits that are vehicle-specific and reference the exact make, model, and engine code. Proper fit reduces the need for trimming or modification, limits installation time, and lowers the risk of gasket extrusion or uneven clamping.
Kit Completeness
A comprehensive gasket kit should include all the pieces needed for the intended job, whether that is a head gasket replacement or a full engine overhaul. Missing parts force you to source additional gaskets, delaying repairs and increasing the chance of mix-matched materials.
Look for kits that list included components such as head gaskets, valve cover gaskets, intake and exhaust gaskets, timing cover and oil pan gaskets, as well as common seals and O-rings. For overhauls, inclusion of all internal seals and fastener gaskets reduces the number of service trips to parts suppliers.
Compatibility With Engine Services
Consider what level of service you are performing and select a kit that matches that scope. For a head gasket replacement you need precise combustion sealing and associated seals; for an engine overhaul you need a broader set that covers all external and internal sealing surfaces.
Matching the kit to the job ensures you have the right components for torque sequences, surface finishes, and any required resurface tolerances. It also helps you plan for associated consumables, such as sealants and new fasteners, when necessary.
Temperature and Chemical Resistance
Gaskets are exposed to extreme temperatures and constant contact with oil and coolant, so chemical and thermal resistance are critical. Materials that degrade when exposed to oil additives or coolant chemistries will fail sooner and can cause leaks.
Verify that materials are specified for automotive use and rated for the operating temperature range of the Subaru Impreza engine. Resistance to coolant and oil absorption helps preserve sealing integrity, especially around head and intake gaskets where fluids and combustion gases are nearby.
Ease Of Installation
Ease of installation affects labor time and the likelihood of a correct seal. Kits that are easy to position and include clear labeling reduce installation errors and make it more practical for home mechanics and professionals alike.
Consider gasket thickness, whether gaskets require sealant, and if the kit includes guidance on torque sequences or special handling notes. Features like pre-cut alignment tabs, reinforced sealing rings, or gaskets that remain flexible during handling can simplify the process and lead to better outcomes.
How We Chose the Best Subaru Impreza Engine Gasket Set
Our selection process prioritized items that deliver dependable sealing, accurate fitment to Subaru Impreza engines, and comprehensive coverage for typical repairs. We focused on material construction, including multi-layer steel or high-temperature composites, because gasket materials determine longevity and resistance to combustion and oil exposure. Fitment accuracy was another core criterion; gaskets must match engine passages and bolt patterns to prevent leaks and simplify installation.We also evaluated kit completeness, looking for sets that include head gaskets, intake and exhaust gaskets, valve cover gaskets, oil pan gaskets, timing cover gaskets, and common seals so mechanics do not need to source missing pieces. Durability under thermal cycling and resistance to oil and coolant contamination were considered to assess long-term performance. Finally, we screened out incomplete single-gasket pieces and products that lacked clear vehicle-specific fit information. Exclusions include universal or one-size-fits-all kits that do not explicitly suit Subaru Impreza engines and products missing key seals required for common repairs.
Our full evaluation process is outlined in our review methodology.
FAQ
How do I know if I need a full gasket set or just a head gasket replacement?
It depends on the symptoms and the scope of work. If you have localized symptoms such as white smoke, coolant loss, or compression issues, a head gasket replacement may be the necessary repair. If the engine is being disassembled for an overhaul or multiple leaks are present, a complete gasket set that includes valve cover, oil pan, timing cover, and seals is usually more appropriate.
Should I use sealant with Subaru Impreza gaskets?
Whether to use sealant depends on the gasket type and the vehicle service manual. Some gaskets are designed to seal without additional sealants, while others recommend specific sealants at particular joints. Follow manufacturer guidance where available, and use sealants sparingly in areas called out in service procedures to avoid excess material entering oil or coolant passages.
Can I reuse old gaskets during reassembly?
Reusing gaskets is generally not recommended because most gaskets compress and conform to mating surfaces during initial installation. Reused gaskets may not reseal correctly and can lead to leaks. It is usually better to install new gaskets for any major repair to ensure consistent sealing performance.
What should I inspect on the engine before installing new gaskets?
Inspect all mating surfaces for flatness, corrosion, and residue that could prevent a proper seal. Check bolt holes and threads, and verify that coolant and oil passages are clean. If cylinder head or block surfaces are warped or damaged, resurfacing or machining may be required to achieve a reliable seal.
How long should a quality gasket set last after proper installation?
A properly selected and installed gasket set can last for many years under normal driving conditions, but longevity depends on material quality, engine maintenance, and operating conditions. Regular coolant care and avoiding overheating are important factors that influence gasket life, and periodic inspection after major repairs is prudent.
Conclusion
When choosing a Subaru Impreza engine gasket set, prioritize material quality, accurate fitment, and the kit contents that match the level of service you plan to perform. Balancing thermal and chemical resistance with ease of installation will reduce the chance of repeat leaks and shorten repair time.Think about whether you need a head gasket-focused kit or a full overhaul set, and confirm that the kit references Subaru Impreza fitment to avoid compatibility issues. Selecting the right combination of sealing materials and completeness helps ensure a durable, trouble-free repair.
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