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If your 2005-2009 Subaru Outback is showing signs of cooling trouble, swapping the radiator can restore dependable engine temperatures and prevent costly downstream damage. A correctly sized, well-built radiator improves heat rejection and reduces the risk of overheating on long drives or in traffic. This guide covers the top radiators shortlisted for the 2005-2009 Outback, focusing on fitment, cooling capacity, and durability under everyday driving conditions.Below you will find our top picks and concise buying guidance that explains the evaluation criteria and practical installation considerations.
Looking for other parts? See all Subaru Outback parts & accessories.
Top Picks at a Glance
| Best Overall The best all-around choice for most situations | Readair Engine Coolant Radiator Assembly with Transmission Oil Cooler for Subaru |  |
| Best Quality Built to a higher standard if you want something more solid | BDFHYK 2-Row 40mm Aluminum Performance Radiator for Subaru 2.5L |  |
| Best Value The sweet spot between price and what you get | PHILTOP CU2777 Replacement Aluminum Radiator |  |
| Best Budget The cheapest option that still gets the job done reliably | Torchbeam CU2777 Aluminum Radiator Replacement |  |
| Highest Rated A top-rated pick with lots of positive feedback | Alpaspare 2778 Direct-Fit Cooling Radiator for Subaru 2005-2017 |  |
| Most Popular A crowd favorite that many people choose with confidence | SCITOO Radiator compatible with 2005–2009 Subaru Legacy/Outback 2.5L |  |
| Best Seller A high-volume bestseller chosen again and again | DWVO Complete Radiator Compatible with select Subaru 2.0L/2.5L |  |
1. Readair Engine Coolant Radiator Assembly with Transmission Oil Cooler for Subaru
| Transmission Oil Cooler Included | Yes |
|---|---|
| Core Height | 13-3/8 inch |
| Core Thickness | 5/8 inch |
| Core Width | 27-1/16 inch |
| Inlet/Outlet Diameter | 1-9/16 inch |
This Readair radiator is a direct-fit replacement built around an aluminum core with a brass transmission oil cooler integrated into the assembly. It is intended as a like-for-like installation for compatible Subaru H4 vehicles and is used to restore engine cooling and cool automatic transmission fluid without modifying factory mounts or plumbing. Notable features include TIG-welded core construction, PA66 GF30 inlet/outlet tanks, leak-tested assembly, and a treated protective coating intended to resist corrosion. In practice the unit should simplify replacement jobs by matching factory connections and including the transmission cooler so you do not need a separate part. Expect improved cooling reliability compared with an aged or damaged original and straightforward installation for a competent DIYer or a shop. Limitations to note are that this is a replacement radiator only and does not include an engine oil cooler, and fitment is restricted to the listed Subaru models and transmission-equipped variants, so confirming compatibility before purchase is important.
Best for: Drivers seeking a balanced, reliable factory-style radiator replacement for routine maintenance or repair on a compatible Subaru H4 who want a straightforward swap that restores cooling and transmission fluid cooling.
Less Ideal for: Those who need an upgraded performance radiator for heavy-duty towing, track use, or cars requiring an engine oil cooler integrated into the assembly should look elsewhere.
- Integrated transmission oil cooler removes need for a separate cooler when replacing radiator
- Aluminum core with TIG-welded joints and treated coating for corrosion resistance
- Leak-tested assembly with high-grade plastic tanks to improve initial durability
- Direct OEM-style fit for listed Subaru H4 models simplifies installation
- Does not include an engine oil cooler, so vehicles that require one need an additional part
Verdict: A dependable, direct-fit replacement radiator with an integrated transmission cooler that restores factory-style cooling for 2005-2009 Outback owners prioritizing balanced reliability and straightforward installation.
2. BDFHYK 2-Row 40mm Aluminum Performance Radiator for Subaru 2.5L
| Model | MMRAD-STI-08 |
|---|---|
| Core Type | 2ROW-40MM tube-and-fin |
| Material | AA5052 aluminum |
| Inlet/Outlet | 1.50" × 1.50" |
| Fitment | Subaru 2.5L Impreza/Legacy/Outback/WRX STI years listed |
This BDFHYK performance radiator replaces the factory unit with a 2-row, 40 mm tube core built from AA5052 aluminum and a brazed core for improved heat transfer. It is intended as a direct-fit replacement for select Subaru 2.5L models and is typically used by owners upgrading cooling for spirited driving, towing, or hotter climates. Notable features include a CNC-machined radiator cap, an OEM-style brass petcock drain, and a tube-and-fin design claimed to boost heat dissipation by roughly 30 to 45 percent compared with ordinary radiators. In practice that means lower operating temperatures under sustained load and a larger coolant capacity to help reduce boil-over risk during track days or heavy use. The radiator is fully TIG welded and pressure tested at the factory, which supports durability, but buyers should confirm fitment against their vehicle and be prepared for a professional install if hoses or mounts differ. Surface finish is polished aluminum so it may show road wear without protective coatings.
Best for: Drivers who push their Subaru 2.5L hard—track enthusiasts or owners in hot climates—who want a factory-replacement style upgrade that lowers operating temps under sustained load.
Less Ideal for: Casual drivers who only need a direct factory replacement and prefer an exact visual OEM match or those who want a radiator with integrated protective coatings for road debris.
- High-conductivity AA5052 aluminum core for improved cooling
- Brazed core and 100% TIG welded construction for leak resistance
- OEM-style brass petcock drain and CNC-machined cap for serviceability
- Two-row 40 mm tube-and-fin design increases coolant capacity and heat dissipation
- Designed for specific Subaru 2.5L applications so cross-vehicle fitment is limited
Verdict: Choose this radiator if you need a higher-capacity, factory-style aluminum upgrade to keep a Subaru 2.5L running cooler under heavy use.
3. PHILTOP CU2777 Replacement Aluminum Radiator
| Core Width | 26-15/16 in |
|---|---|
| Core Height | 13-3/8 in |
| Core Thickness | 5/8 in |
| Inlet Diameter | 1-9/16 in |
| Outlet Diameter | 1-9/16 in |
This PHILTOP CU2777 radiator is a direct-fit replacement intended to restore proper cooling on compatible Subaru models. It is an aluminum core radiator built to the vehicle-specific dimensions listed by the manufacturer so it installs without trimming or modification. Typical use is one-for-one replacement of a failing or leaking factory radiator to regain cooling capacity and prevent overheating. Notable features include a machined exterior, 26-15/16 inch core width and 13-3/8 inch core height with a 5/8 inch thickness, and 1-9/16 inch inlet and outlet diameters, which match common factory hose sizes. The unit claims IATF16949 design standards for durability and aims to meet factory-spec fit and function. Practical benefits are straightforward: simplified installation, restored coolant flow, and a lightweight aluminum construction. Limitations are that compatibility is limited to the specified Subaru model years and engine variants, so verify fitment before buying, and buyers who prefer OEM-branded parts may note this is an aftermarket replacement rather than a factory-branded unit.
Best for: Buyers who want a practical, no-fuss replacement to restore cooling on the covered Subaru models and prioritize straightforward installation and reliable performance.
Less Ideal for: Those seeking an OEM-branded radiator for exact factory provenance or buyers who need a universal or custom fit solution outside the listed Subaru models.
- Direct-fit design simplifies installation with no modification required
- Aluminum core construction restores cooling while reducing weight compared with older cores
- Explicit core dimensions and inlet/outlet sizes match common factory hose fittings
- Designed to IATF16949 standards for manufacturing consistency and durability
- Aftermarket unit rather than a factory-branded radiator so finish and exact tolerances may vary from OEM
Verdict: Choose this direct-fit PHILTOP radiator if you want a practical, easy-to-install replacement that restores factory cooling performance for the covered Subaru models.
4. Torchbeam CU2777 Aluminum Radiator Replacement
| Manufacturer | Torchbeam |
|---|---|
| Model | CU2777 |
| Exterior | Machined |
| Manufacturer Part Number | 5035RDT095ZUS |
This Torchbeam CU2777 is a straightforward aluminum replacement radiator intended to bring a tired cooling system back to proper operating temperature. It uses multi-louvered aluminum fins and an anti-corrosion coating to improve heat transfer and resist corrosion compared with older or damaged radiators. Typical use is a direct swap during a cooling-system repair or as an upgrade when a factory radiator begins to fail; installation follows standard radiator replacement steps and is compatible with the specified Subaru model years. Notable features include a machined exterior and a construction meant to be leak-free, which helps reduce the chance of coolant loss after installation. In practice you can expect improved thermal stability and a durable unit that handles everyday driving and heavier duty use better than many low-end stock replacements. The radiator is a basic, budget-focused replacement so it lacks performance extras like built-in transmission coolers or upgraded core capacity for high-performance tuning, meaning it is best suited for routine repairs and owners seeking reliable everyday cooling rather than track use.
Best for: Owners replacing a failing radiator who want an affordable, reliable factory-style cooling replacement for routine daily driving on a tight budget.
Less Ideal for: Those building performance, towing, or track-focused cooling systems or anyone needing additional integrated coolers should look at higher-capacity or performance radiators.
- Aluminum multi-louvered fins and anti-corrosion coating improve heat transfer and durability
- Engineered to be leak-free to reduce risk of coolant loss after installation
- Designed to match factory fitment for the listed Subaru model years for a straightforward replacement
- Machined exterior construction suggests consistent build quality for everyday driving
- No integrated transmission cooler or performance-oriented features for heavy towing or track use
- Limited to the specified Subaru model years and not intended for high-performance cooling upgrades
Verdict: A cost-conscious, factory-style aluminum replacement that restores reliable cooling for 2005-2009 Outback owners without adding performance extras.
5. Alpaspare 2778 Direct-Fit Cooling Radiator for Subaru 2005-2017
| Compatible models | Subaru Outback 2005-2014; Forester 2009-2013; Impreza 2008-2016; Legacy 2005-2014; Crosstrek/WRX/XV variants 2012-2017 |
|---|---|
| Material | Aluminum |
| Core length | 13.38in |
| Core height | 27.02in |
| Core thickness | 0.62in |
This Alpaspare 2778 radiator is a direct 1:1 replacement designed to restore or upgrade cooling for compatible Subaru models, including Outback 2005–2014. Made from aluminum, it aligns with original mounting points and hose connections so installation requires no cutting or modification, which simplifies DIY swaps and shop installs. The unit is tested for pressure, leaks, and thermal cycling and claims OEM-spec heat dissipation to keep engine temperatures stable during everyday driving and heavier loads. Notable features include measured core dimensions and matching inlet/outlet sizes to the factory system and compatibility with automatic transmissions. Practical benefits are straightforward fitment, corrosion-resistant construction, and cooling capacity suitable for highway use and occasional towing. The main limitations are that compatibility is limited to the listed Subaru years and models and you should confirm part numbers and transmission type before ordering to avoid a mismatch.
Best for: Buyers who prioritize a reliable, factory-quality replacement that installs cleanly and restores original cooling performance for a 2005–2009 Outback.
Less Ideal for: If you need a heavy-duty performance or aftermarket high-capacity radiator for racing or sustained extreme towing, choose a purpose-built performance unit instead.
- Direct 1:1 fit with factory mounting points for listed Subaru models
- Aluminum construction resists corrosion and supports long service life
- Pressure, leak, and thermal-cycle testing claimed to meet factory cooling standards
- No modifications required so suitable for DIY or professional replacement
- Fitment limited to the specific Subaru model years and trim applications listed
Verdict: Choose this radiator if you want a corrosion-resistant, factory-fit replacement that reliably restores cooling for a 2005–2009 Subaru Outback.
6. SCITOO Radiator compatible with 2005–2009 Subaru Legacy/Outback 2.5L
| Compatible vehicles | 2005–2009 Subaru Legacy/Outback 2.5L |
|---|---|
| Row count | 1-Row |
| Transmission oil cooler | Included |
| Inlet diameter | 1.56 inch |
| Outlet diameter | 1.56 inch |
This SCITOO radiator is an aftermarket replacement built to match the factory-style fit for 2005–2009 Subaru Legacy and Outback 2.5L vehicles. It replaces a failing core to address coolant leaks, overheating, and reduced heat dissipation; the listing notes transmission oil cooler integration and standard inlet/outlet diameters that match stock hose sizes. Typical use is a one-for-one radiator swap during a cooling system repair or overhaul; the seller emphasizes upgraded packaging and provides installation videos to simplify DIY replacement. Practical benefits include restoring reliable cooling, reducing engine temperature spikes, and avoiding the expense of dealer parts while keeping a factory-like mounting layout. Limitations are that this is an aftermarket unit rather than a factory-made assembly so finish, minor fitment tolerances, and long-term durability can vary, and it is a single-row core which may offer less capacity than some multi-row performance radiators. Buyers should verify part numbers and hose/clip compatibility before installation.
Best for: Buyers who want an affordable, ready-to-install replacement to restore proper cooling on a 2005–2009 Subaru Legacy or Outback 2.5L while relying on positive user feedback and clear installation guidance.
Less Ideal for: Drivers seeking a heavy-duty or high-performance multi-row radiator for towing, track use, or significant engine modifications should look at purpose-built upgraded radiators instead.
- Designed to match factory mounting and hose diameters for direct replacement
- Includes transmission oil cooler integration to maintain existing cooling lines
- Seller provides installation videos and improved packaging for safer delivery
- Single-row core keeps the unit lightweight and straightforward to install
- Aftermarket construction may vary from factory-quality in long-term durability
Verdict: A practical, budget-friendly direct-replacement radiator for 2005–2009 Subaru Legacy and Outback 2.5L owners who want to reliably restore cooling without buying dealer parts.
7. DWVO Complete Radiator Compatible with select Subaru 2.0L/2.5L
| Model | CU13092 |
|---|---|
| Manufacturer Part Number | MADWVx6Z0v |
| OEM Part Number | 45111AG00A, 45111AG06A, 45111AJ07A, 45119SC000, F09TECS002 |
| Vehicle Fitment | Select Subaru 2.0L and 2.5L models (see listing) |
This DWVO complete radiator is a direct-fit replacement for specified Subaru 2.0L and 2.5L models and is intended as a factory-quality style swap for a worn or leaking unit. It uses a high-density core with multi-louvered fins to improve heat dissipation and TIG-welded aluminum construction with PA66 GF30 inlet/outlet tanks for strength. The unit ships as a full radiator assembly with foam padding in the corners to prevent shipping damage and includes a user manual but not a radiator cap. Typical use is to replace an aging or damaged factory radiator during routine cooling-system repairs; professional installation is recommended because it ties into the vehicle cooling, fan and possibly oil cooler plumbing. Practical benefits include improved cooling efficiency, corrosion-resistant coating, and direct-fit OEM part-number compatibility for straightforward replacement. Limitations are that the radiator arrives without a cap and any hoses, fittings, or mounting hardware differences should be checked against your vehicle; buyers should confirm exact fitment before purchasing.
Best for: Buyers who prioritize a conservative, reliable replacement that closely matches factory fit and performance for routine cooling-system repairs on covered Subaru 2.0L/2.5L vehicles.
Less Ideal for: People looking for a performance-upgrade radiator with larger capacity, or DIYers who need a plug-and-play kit that includes all hoses, caps, and additional fittings.
- Direct-fit replacement matched to factory part numbers for straightforward swap
- Aluminum core with high-density multi-louvered fins for improved cooling efficiency
- TIG-welded construction and corrosion-resistant coating for durability
- Includes foam corner protection in packaging to reduce shipping damage
- Radiator cap is not included so buyer must retain or purchase one separately
Verdict: A conservative, factory-style replacement radiator that restores cooling performance and fitment confidence for covered Subaru 2.0L/2.5L models.
Choosing the Right 2005-2009 Subaru Outback Radiator: Key Factors to Consider
Fitment and Mounting
Correct fitment is the most important factor for the 2005-2009 Subaru Outback because mounting points, hose locations, and transmission cooler integration differ across model years and engine variants. A radiator that lines up with existing brackets and hoses reduces install time and eliminates the need for modifications.
Mismatched inlets or outlet offsets can cause hose tension or require adapter use, which invites leaks. Verify the radiator matches the Outback's specific hose diameter and placement. If your vehicle has a transmission cooler integrated into the radiator, confirm the unit supports that feature to avoid compatibility problems.
Core Design and Cooling Capacity
Core construction—such as number of rows, tube thickness, and fin density—directly affects how effectively the radiator dissipates heat. For the Outback, choose a core that balances efficiency with airflow needs; denser cores improve heat transfer but can be more susceptible to clogging from debris.
Consider the typical loads your Outback faces. Frequent towing, heavy loads, or extended idling call for radiators with higher cooling capacity. Look for units engineered to maintain lower operating temperatures under sustained stress without causing excessive fan run time.
Material and Corrosion Resistance
Radiator longevity depends on materials and protective treatments. Aluminum cores and tanks are common and offer good thermal conductivity, but quality of brazing and protective coatings matters for resisting road salt and coolant chemistry.
Plastic tanks are lighter and less costly but can become brittle over time; metal tanks or reinforced designs generally outlast simple plastic tanks. Evaluate claimed corrosion protections and warranty terms as indicators of expected service life in climates where road salt or high humidity is present.
Pressure Rating and Seals
A radiator must withstand system pressures from the coolant and cap while maintaining a tight seal at joints and hose connections. Look for radiators rated to the OEM or higher pressure to avoid bulging or leaks under heat cycles.
Quality seals and well-formed mating surfaces reduce the risk of slow leaks at seams and hose connections. Ensure included gaskets or O-rings meet OEM specifications, and verify the cap pressure rating aligns with the vehicle's cooling system requirements.
Ease of Installation and Serviceability
Replacement radiators that minimize labor are preferable for both DIYers and shops. Features that improve serviceability include pre-installed fittings, properly placed mounting tabs, and clear provision for transmission cooler lines where needed.
Accessible drain petcocks, durable mounting ears, and radiators that avoid interfering with surrounding components will cut install time. Consider whether the unit requires additional parts like bracket kits or special hoses, which can add complexity and expense during installation.
Warranty and Support
A solid warranty provides confidence in the radiator's expected lifespan and manufacturer support. For the Outback, a warranty that covers corrosion and workmanship over multiple years indicates the maker stands behind their construction.
Check the warranty coverage details and any conditions such as required coolant types or professional installation. Responsive technical support and clear warranty registration steps simplify claims if defects arise during the coverage period.
Common Radiator Symptoms and What They Mean
Recognizing early signs of radiator trouble helps avoid engine overheating and costly repairs. For the 2005-2009 Outback, watch for coolant puddles under the front of the car, a consistently low coolant level, or visible corrosion on the radiator surfaces.
Overheating during idle or slow traffic often points to reduced cooling efficiency, which could be caused by clogged fins or internal restriction. Intermittent temperature spikes can suggest a failing thermostat or partial blockage, while steady overheating under load typically implicates limited radiator capacity or a failing fan.
- Coolant puddles or wet spots under the front of the vehicle indicate external leaks.
- Frequent need to top off coolant suggests leakage or internal deterioration.
- Temperature gauge climbing at low speeds can mean poor airflow or fan issues.
- Sharp rises in temperature under load point to inadequate heat rejection.
DIY Replacement Tips for the Outback
Replacing the radiator on a 2005-2009 Outback is a moderately involved task but feasible for an experienced DIYer with basic tools. Important preparations include draining the coolant properly, labeling hose positions, and supporting the engine or front components as needed to access mounting points.
Work methodically: disconnect the battery, remove the radiator fan shroud if required, detach coolant hoses and transmission cooler lines if present, and unbolt the radiator mounts. Inspect hoses, clamps, and the drain plug while the system is open and replace worn components at the same time to avoid repeat labor.
- Always let the engine cool fully before starting and capture coolant for proper disposal.
- Use new hose clamps and consider replacing upper and lower hoses if they show age.
- Bleed the cooling system after installation to remove air pockets and prevent hot spots.
When to Repair Versus Replace
Minor external leaks from a damaged fin or a small seam can sometimes be temporarily repaired, but permanent fixes are often limited in durability. For the Outback, weigh the age of the radiator, extent of corrosion, and presence of internal blockages when deciding whether to repair.
If the radiator shows multiple leaks, extensive corrosion, or internal clogging that impairs flow, replacement is the safer long-term choice. Repairs may be cost-effective for isolated, recent damage, but replacing a compromised radiator prevents repeat failures and additional engine risk.
- Small localized leaks may be patched temporarily, but expect limited longevity.
- Widespread corrosion or multiple leak points generally warrant replacement.
- Internal clogging that reduces flow should prompt replacement rather than repair.
Choosing Coolant and Maintenance Intervals
Maintaining the right coolant concentration and following recommended flush intervals extends radiator life and keeps the Outback's cooling system functioning optimally. Use the coolant type specified for Subaru engines and maintain the correct antifreeze-to-water ratio to protect against corrosion and overheating.
Periodic coolant system maintenance includes inspecting hoses and clamps, checking the radiator cap pressure, and performing a coolant flush at intervals appropriate for the coolant product and driving conditions. Routine visual inspection can catch slow leaks or physical damage before they become critical.
- Follow Subaru-recommended coolant type and concentration.
- Inspect hoses and clamps during every coolant service.
- Perform a coolant flush based on mileage and coolant manufacturer guidance.
Installation and Fitment Checklist
Before purchasing or installing a radiator for your 2005-2009 Outback, verify a clear checklist: correct year range compatibility, matching hose inlet and outlet locations, support for transmission cooler lines if applicable, and included mounting hardware or clear documentation for any additional brackets required.
Confirm that the replacement unit does not require re-routing of wiring or modification of adjacent components. Having a checklist reduces the chance of discovering mismatched parts after the old radiator is removed and minimizes downtime.
- Confirm hose diameters and locations match your Outback.
- Verify transmission cooler provisions if your vehicle uses an integrated cooler.
- Ensure mounting tabs and brackets align with factory points.
Still looking for the perfect fit?
Select your Subaru Outback configuration to see the most relevant Radiators recommendations
How We Chose the Best 2005-2009 Subaru Outback Radiator
We evaluated candidate radiators for the 2005-2009 Subaru Outback using a practical set of filters designed for long-term reliability and real-world performance. First, fitment accuracy was required: units had to match the Outback's mounting points, hose locations, and transmission cooler provisions where applicable. Second, cooling performance was assessed through reported core design and material quality, favoring radiators with efficient fin density and high-conductivity construction. Third, corrosion resistance and coating or material choices were considered to ensure longevity in varied climates. Fourth, build quality elements such as tank construction, brazing quality, and pressure-cap ratings were reviewed. Fifth, ease of installation including inlet/outlet alignment and included hardware or gaskets influenced selection.We excluded units with unclear fitment documentation, nonstandard hose positions, or widespread reports of premature leaks. We also prioritized radiators that balanced cooling capacity with straightforward installation for DIYers and technicians. In short, the list favors correct fit, robust construction, and proven cooling behavior specifically for the 2005-2009 Subaru Outback.
Our full evaluation process is outlined in our review methodology.
FAQ
How can I tell if the radiator is leaking on my Outback?
Look for coolant puddles beneath the front of the car, a persistent low coolant level, or wet corrosion on the radiator. You may also notice a sweet smell or steam from the engine bay when the system is hot.
Can I replace the radiator myself on a 2005-2009 Outback?
Yes, an experienced DIYer can replace the radiator with proper tools and preparations. The job requires draining coolant, correctly disconnecting hoses and transmission cooler lines if present, and bleeding the system afterward. If you are unsure, a mechanic can ensure proper fitment and pressure testing.
Do I need to flush the cooling system when installing a new radiator?
It is recommended to flush the cooling system to remove sediment and old coolant that could reduce the new radiator's effectiveness. Flushing also ensures the correct coolant chemistry and prevents premature corrosion.
What radiator symptoms suggest internal clogging versus an external leak?
Consistent overheating under load or poor recovery after a temperature spike can indicate internal clogging that reduces flow. External leaks are usually visible as puddles or wet spots and often lead to a steady drop in coolant level.
Should I replace hoses and clamps at the same time as the radiator?
Often it is wise to replace aged hoses and use new clamps during radiator service. Old hoses can be brittle or swollen and may fail after reassembly, leading to repeat labor.
How long should a replacement radiator last on an Outback?
Lifespan depends on materials, environmental exposure, and maintenance, but a well-made radiator installed correctly can last many years. Regular coolant maintenance and inspections help achieve maximum service life.
Final Verdict
Prioritize correct fitment and sufficient cooling capacity when selecting a replacement radiator for the 2005-2009 Subaru Outback. Confirm inlet and outlet alignment, mounting points, and whether the radiator supports integrated transmission cooling if required. Balance material durability and pressure ratings against ease of installation and available warranty coverage.Ultimately, choose a radiator that addresses your driving demands and climate exposure while minimizing installation complexity. Replacing a compromised radiator with a properly fitted, well-built unit reduces the risk of overheating and gives you the most reliable long-term outcome.
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