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If you own a 2002-2007 Subaru Impreza, a healthy alternator is vital for dependable starting, stable voltage, and reliable accessory power. Symptoms like dimming lights, slow cranking, or a dead battery often trace back to the charging system rather than the battery itself. Choosing the right alternator matters because fitment, amperage, and build quality affect daily drivability and long-term reliability.This guide covers seven shortlisted alternators chosen for the Impreza years listed and explains the evaluation criteria used. You will learn which attributes matter for fit, electrical performance, and durability, with practical tips for testing and installation. Next are the top contenders followed by detailed buying factors and ownership guidance.
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 | OXCANO 11058N Replacement Alternator, 12V 90A, 5-Groove Clockwise Pulley |  |
| Best Quality Built to a higher standard if you want something more solid | PHILTOP 11226N Replacement Alternator 110A for Subaru Impreza/Forester/Legacy/Outback 2.5T |  |
| Best Value The sweet spot between price and what you get | TadaMark 90A Replacement Alternator for 2.5L Subaru (Manual/Automatic fitments listed) |  |
| Best Budget The cheapest option that still gets the job done reliably | Youxmoto Alternator 90A for Subaru 2.5L (Manual Transmission, Non-Turbo) |  |
| Highest Rated A top-rated pick with lots of positive feedback | KAC 13890N 75A Alternator for 2002–2005 Subaru Impreza |  |
| Most Popular A crowd favorite that many people choose with confidence | PHILTOP 13890N Replacement Alternator for 2002–2005 Subaru Impreza 2.0T/2.5L (75A) |  |
| Best Seller A high-volume bestseller chosen again and again | A-Premium 12V 90A Alternator for Subaru Impreza/Forester (5-Groove, Clockwise) |  |
1. OXCANO 11058N Replacement Alternator, 12V 90A, 5-Groove Clockwise Pulley
| Voltage | 12V |
|---|---|
| Amperage | 90A |
| Rotation | Clockwise |
| Pulley | 5-Groove Clutch Pulley |
This OXCANO alternator is a plug-in replacement designed for Subaru Impreza (2004-2010), Forester (2006-2010) and Saab 9-2X (2006) 2.5L engines. It supplies 12 volts at a 90 amp output and uses a clockwise rotation with a five-groove clutch pulley, so installation follows factory mounting and belt routing on compatible cars. Typical use is to restore charging system function after an original unit fails or to upgrade a tired alternator that struggles under accessory load. The unit arrives complete and ready to install and its 90A rating is adequate for stock electrical systems with modest accessory use. Buyers should note the pulley type and rotation direction must match the vehicle, and this is a single-amperage option so it is not targeted at high-demand audio or heavy accessory setups. For the balanced buyer wanting a straightforward factory-style replacement, this alternator delivers compatible performance without unnecessary extras.
Best for: Buyers seeking a reliable, factory-style replacement to restore charging on mid-2000s Subaru 2.5L vehicles who value straightforward fitment and stock-level performance.
Less Ideal for: Drivers planning high-current accessory installs, big audio systems, or major electrical upgrades should look for higher-output or performance alternators instead.
- Direct-fit replacement for specified Subaru Impreza and Forester applications
- Factory-style 12V 90A output suitable for stock electrical loads
- Includes clockwise rotation and 5-groove clutch pulley for correct belt fitment
- Sold as a complete unit ready for bolt-in installation
- 90A output may be marginal for heavily modified electrical systems or high-power audio setups
Verdict: A solid factory-style 90A replacement alternator for mid-2000s Subaru 2.5L cars when you need dependable, direct-fit charging performance.
2. PHILTOP 11226N Replacement Alternator 110A for Subaru Impreza/Forester/Legacy/Outback 2.5T
| Amperage | 110 A |
|---|---|
| Voltage | 12 volts |
| Position | Front |
| Manufacturer | PHILTOP |
This PHILTOP 11226N alternator is a direct-fit replacement designed for mid-2000s Subaru 2.5T engines and delivers 110 amps of charging at 12 volts. It installs like a factory-style unit and is intended for routine aftermarket replacement when the original fails or when upgrading to a fresh, tested unit. The alternator emphasizes durability with vibration and shock resistance, high-voltage insulation, and salt-spray endurance testing that suggest good longevity in harsh climates. Practical benefits include high-output charging to keep accessories and charging systems stable under load and sealed bearings and lubricants that reduce noise and wear. The unit claims OE-matching cores and construction for reliable high-speed operation, but buyers should confirm exact vehicle compatibility before purchasing and be prepared to reuse existing mounting bolts in some cases. While it is built to factory specifications, professional install or proper tools are recommended to ensure correct wiring and belt tension.
Best for: Drivers who want a high-output, factory-matching replacement for mid-2000s Subaru 2.5T engines and prioritize reliable charging for performance accessories and daily-driving demands.
Less Ideal for: Someone looking for a high-performance upgraded alternator with higher-than-stock amperage or custom pulley/drive options should consider specialty performance units instead.
- 110 A output supports demanding electrical loads and accessory use
- Direct-fit design intended to match factory form and simplify installation
- Designed for durability with vibration resistance and salt-spray endurance testing
- Sealed bearings and high-temperature lubricants reduce noise and wear
- May not include mounting bolts or extra hardware in all cases
- Compatibility must be verified for specific vehicle submodels before ordering
Verdict: Choose this unit if you need a reliable, factory-style 110A replacement to restore strong, stable charging on mid-2000s Subaru 2.5T models.
3. TadaMark 90A Replacement Alternator for 2.5L Subaru (Manual/Automatic fitments listed)
| Voltage | 12 volts |
|---|---|
| Amperage | 90 A |
| Rotation | CW |
| Clock | 11 |
| Pulley Class | S5 |
This TadaMark alternator is a direct-replacement style unit built to match common 2.5L Subaru charging needs. It supplies 90 amps at 12 volts with clockwise rotation, an 11 o'clock clock position, S5 pulley class, and an internal regulator and fan—specs that align with many Subaru 2.5L factory alternators. Typical use is swapping out a failed or weak alternator on compatible Forester, Baja, Impreza, Legacy, and Outback models (and the Saab 9-2X manual) where the listed clock position and pulley fit the vehicle. Benefits include a full set of reference numbers for cross-checking fit, a compact factory-style design that simplifies installation for DIYers or shops, and manufacturer testing claimed to meet or exceed factory performance. Limitations are that it is specified for non-turbo 2.5L engines and some fitments are manual-transmission only, so verifying transmission and turbo status is essential before purchase. Expect a straightforward replacement when the unit matches your vehicle's mounting, pulley, and electrical connectors.
Best for: Buyers who prioritize a practical, like-for-like replacement for a worn alternator on 2.5L Subaru models and want clear fitment references to minimize guesswork.
Less Ideal for: Avoid this unit if you have a turbocharged 2.5L Subaru or if your vehicle requires a different clock position or pulley specification.
- 90 amp output suitable for stock electrical loads on 2.5L Subaru engines
- Includes internal regulator and factory-style fan for simplified installation
- Multiple OEM/reference numbers provided for accurate fit confirmation
- Clock position and pulley class listed to help ensure physical compatibility
- Not compatible with turbocharged 2.5L engines and some fitments limited to manual transmission
Verdict: A straightforward 90A factory-style replacement for non-turbo 2.5L Subaru models when the listed clock position and pulley match your vehicle.
4. Youxmoto Alternator 90A for Subaru 2.5L (Manual Transmission, Non-Turbo)
| Amperage | 90 Amps |
|---|---|
| Voltage | 12 Volts |
| Wattage | 1.4 KW |
| Rotation | CW |
| Regulator | IR |
This Youxmoto alternator is a direct-replacement style unit intended for non-turbo 2.5L Subaru engines with manual transmissions. It provides 90 amps of charging capacity at 12 volts and is assembled with an aluminum housing and thickened copper windings to deliver stable output for charging the battery and running accessories. Installation is described as in-situ with no extra modification or tuning, so it is typically used as a one-to-one swap when an original alternator fails. Notable features include an internal regulator, clockwise rotation, and an S5 pulley class; the seller also notes corrosion protection on the windings. Practical benefits are straightforward: it restores charging function, supports common electrical loads, and is aimed at drivers who need a cost-effective replacement rather than a performance upgrade. Limitations are that it is specified only for manual-transmission, non-turbo 2.5L applications and offers 90 amps, which may be marginal for heavily modified electrical systems or high-accessory setups.
Best for: Buyers looking for an affordable, drop-in replacement to restore charging on a non-turbo 2.5L Subaru with a manual transmission who prioritize cost and straightforward installation.
Less Ideal for: Anyone who needs a higher-output unit for heavy aftermarket electrical loads or those with turbocharged engines or automatic transmissions should look elsewhere.
- Vehicle-specific fit for non-turbo 2.5L Subaru manual-transmission applications
- Stable 12V/90A output suitable for stock charging needs
- Aluminum housing and thicker copper windings for improved durability
- Designed for direct in-situ installation with internal regulator included
- Limited to manual-transmission, non-turbo 2.5L fitments so not universal
- 90-amp output may be insufficient for cars with added electrical accessories
Verdict: A budget-friendly, direct-fit 90A alternator that restores reliable charging for non-turbo 2.5L Subaru manual-transmission cars.
5. KAC 13890N 75A Alternator for 2002–2005 Subaru Impreza
| Amperage | 75 A |
|---|---|
| Voltage | 12 volts_of_alternating_current |
| Position | Front |
| Manufacturer | KAC |
This KAC 13890N alternator is a direct-fit replacement for specified 2002–2005 Subaru Impreza and 2005 9-2X 2.0L models, offering 75 amps at 12 volts for everyday driving and accessory loads. It uses die-cast aluminum housing and copper windings to improve heat dissipation and corrosion resistance, while the built-in regulator is engineered to match factory voltage control for steady output to the vehicle electrical system. Installation is plug-and-play for compatible models, so it suits both DIYers and shops replacing a failed unit. Practical benefits include resolving weak-charge symptoms, powering lighting and audio without voltage sag, and delivering a durable, factory-quality alternative to worn originals. Limitations are that it is specified for a narrow model-year and engine scope so fitment must be confirmed, and its 75A rating is adequate for stock electrical loads but may be marginal if you plan to add heavy aftermarket accessories that increase charging demand.
Best for: Buyers who prioritize a dependable, factory-quality replacement to restore original charging performance on the specified Subaru Impreza models and want a straightforward installation.
Less Ideal for: Drivers planning major electrical upgrades or added high-draw accessories should consider a higher-amperage alternator designed for increased charging demand.
- Direct-fit plug-and-play design for listed Impreza/9-2X models speeds installation
- 75A output with factory-style regulator provides stable voltage for stock electrical systems
- Die-cast aluminum housing and copper windings improve heat dissipation and corrosion resistance
- 75 amp capacity may be insufficient for vehicles with high-demand aftermarket electrical add-ons
Verdict: Choose this unit when you need a reliable, factory-style 75A replacement to restore dependable charging on the listed 2002–2005 Subaru Impreza applications.
6. PHILTOP 13890N Replacement Alternator for 2002–2005 Subaru Impreza 2.0T/2.5L (75A)
| Amperage | 75A |
|---|---|
| Voltage | 12V |
| Pulley Class | S5 |
| Rotation | CW |
This PHILTOP 13890N alternator is a direct-replacement style unit built for 2002–2005 Subaru Impreza 2.0T and 2.5L models and the 2005 Saab 9-2X 2.0T. It delivers 75 amps at 12 volts with CW rotation and an S5 pulley, so installation is plug-and-play for matching factory setups. The listing emphasizes factory-matched cores, varnished windings, and testing that includes 2000-hour endurance and salt spray resistance, which suggests it is engineered for durability in the varied conditions Subaru owners face. Practical benefits include stable voltage output for charging and accessories, temperature and vibration resistance, and compatibility with existing mounting hardware. The product notes that bolts and small accessories are generally not included, and professional tools or guidance may be needed for safe installation. For buyers prioritizing proven compatibility and documented testing, this alternator offers a sensible balance of reliability and straightforward replacement, though confirm fitment carefully against OEM part numbers before ordering.
Best for: Buyers who want a replacement alternator with documented durability testing and clear fitment for 2002–2005 Impreza models and who value social proof and risk reduction when choosing a replacement part.
Less Ideal for: Shoppers looking for a high-output upgrade or a different pulley/rotation configuration should consider specialized performance units instead.
- Designed to match factory electrical specifications (75A, 12V) for listed Subaru Impreza engines
- Factory-matched core and varnished windings claimed to improve durability and high-speed stability
- Tested for endurance, salt spray resistance, extreme temperatures and vibration
- Plug-and-play fitment intended to use existing bolts and mounting points
- Hardware like bolts and small accessories are generally not included
- Requires verification against OEM part numbers to ensure correct fit before purchase
Verdict: A factory-style 75A replacement built and tested for durability that lets cautious Impreza owners swap in a like-for-like alternator with confidence.
7. A-Premium 12V 90A Alternator for Subaru Impreza/Forester (5-Groove, Clockwise)
| Voltage | 12V |
|---|---|
| Amperage | 90A |
| Rotation | Clockwise |
| Pulley | 5-Groove Clutch Pulley |
This A-Premium alternator is a direct replacement-style unit designed to restore charging performance on compatible Subaru Impreza and Forester 2.5L engines. It delivers 12 volts at 90 amps through a 5-groove clutch pulley with clockwise rotation, so it matches the pulley and output expectations of the original charging system. The unit is built from entirely new components rather than remanufactured parts and includes a one-year unlimited-mileage guarantee, which offers reassurance for buyers who prefer lower risk when replacing a critical component. Installation follows the same mounting and belt arrangement as the factory part, so a competent DIYer or a professional shop can install it without modification. Limitations are that fitment is specific to the listed Subaru and Saab 9-2X years and the 90A output may be insufficient for heavily accessorized vehicles with high electrical demand. Buyers should confirm pulley type and rotation on their vehicle before purchase.
Best for: Buyers who want a low-risk, like-for-like factory-style replacement alternator for standard Subaru Impreza or Forester 2.5L charging systems and value a new-component unit with a warranty.
Less Ideal for: Owners planning extensive electrical upgrades or who need higher charging capacity should consider higher-amperage alternatives or performance chargers.
- Built from 100% new components for consistent factory-quality replacement
- Matches factory pulley configuration with 5-groove clutch pulley and clockwise rotation
- 90A output suitable for standard charging needs on listed Subaru 2.5L engines
- Includes a one-year unlimited-mileage guarantee for added buyer confidence
- Single amperage option may not support vehicles with heavy aftermarket electrical loads
Verdict: A-Premium provides a factory-style 12V/90A replacement alternator built from new components and backed by a one-year guarantee, making it a safe swap for standard Subaru Impreza and Forester 2.5L charging systems.
Choosing the Right 2002-2007 Subaru Impreza Alternator: Key Factors to Consider
Fitment and Mounting
Correct fitment is the foundation of a successful alternator replacement for a 2002-2007 Subaru Impreza. Differences in bracket locations, ear positions, and connector orientations will affect whether an alternator bolts up without modification. A unit that matches the factory mounting points reduces installation time and avoids the need for custom brackets or spacers.
Mounting also affects alignment with the accessory belt. Misaligned pulleys accelerate belt wear and can cause accessory noise or premature failure. For the Impreza, confirm the alternator's ear spacing and pulley centerline match the factory specifications. Check that the electrical plug and main output stud are located where the factory harness reaches without stretching or re-routing.
Electrical Output and Amperage
Amperage rating determines how much continuous current the alternator can supply for charging the battery and powering accessories. For a 2002-2007 Subaru Impreza, typical factory output is sized for the stock electrical load. If you run additional accessories such as upgraded audio, lighting, or driving lights, you may need a higher-rated unit.
However, higher amperage units should still regulate voltage tightly to avoid overcharging. Consider both peak and continuous output figures and how the unit performs at low idle RPM, since stop-and-go city driving demands good output at lower engine speeds. Verify manufacturer specifications for amperage at specific RPM points rather than relying on a single maximum number.
Voltage Regulation and Charging Stability
Stable voltage regulation is critical to protect the Impreza's electrical components and to maintain battery health. A regulator that allows voltage to float too high can overheat electronics and shorten battery life; one that undercharges will leave you with a weak battery and starting issues. Built-in regulators vary in design and quality, and some replacement units use external regulators or refurbished originals.
Check that the alternator maintains roughly 13.8 to 14.6 volts across typical operating conditions. Also consider how the regulator behaves under load transients, such as when headlights and HVAC engage simultaneously. A unit that holds steady under changing loads reduces flicker and electronic glitches.
Cooling and Durability
Alternators generate heat and need adequate cooling to maintain longevity. For the Impreza, look for units with robust internal cooling paths, quality bearings, and corrosion-resistant finishes. Poor cooling shortens the life of diodes and the regulator, leading to premature failures.
Durability also depends on the quality of internal components such as the rectifier bridge, brushes, and bearings. Heavy-duty bearings and thicker brushes typically last longer in daily use. Consider the operating environment; cars used in stop-and-go urban traffic or colder climates face different stresses than those used primarily on highways.
Electrical Connections and Harness Compatibility
The alternator's connectors, plug shapes, and output stud locations need to match the Impreza's wiring harness to avoid splicing or adapter hacks. Factory-style connectors reduce the risk of poor contacts and electrical gremlins. Confirm that the unit includes compatible terminal sizes and that any required harness clips or seals are included.
Also review whether the replacement requires any changes to sensor wiring or warning lights. Some alternators use slightly different sense wires or grounding methods; knowing this ahead of installation reduces surprises and labor time.
Serviceability and Warranty
Serviceability influences long-term ownership costs. Alternators that allow for replacement of wear items like brushes, voltage regulators, or rectifiers can be more economical over the vehicle's lifetime. Availability of rebuild kits or reman parts is a practical advantage for owners who prefer repairs over full replacement.
Warranty terms and the clarity of what is covered matter when selecting a unit. A reasonable warranty signals confidence in materials and workmanship, while straightforward warranty procedures reduce downtime. Consider how easy it is to source replacement parts or arrange repairs within the local service network.
Common Alternator Symptoms and Quick Troubleshooting
Recognizing alternator symptoms early can save you from getting stranded. Typical signs include dashboard warning lights, dimming headlights at idle, dead or repeatedly weak batteries, and unusual whining or grinding noises from the engine bay. These symptoms often overlap with battery issues, so a few quick checks can narrow the cause.
Start by measuring system voltage with the engine off and then running. A healthy charging system will show a resting battery voltage around 12.4 to 12.8 volts and a running voltage near 13.8 to 14.6 volts. Inspect belts and pulley alignment next; a loose or glazed belt will reduce charging output and can mimic alternator failure.
- Dim lights at idle but normal at higher RPM indicate low output at low engine speed.
- Rapid battery drain with no accessories on suggests internal diode or regulator issues.
- Noisy bearings or grinding noises mean the alternator likely needs attention even if charging appears adequate.
How to Test an Alternator on a Subaru Impreza
Basic alternator testing can be done with a multimeter and a visual inspection. Start by checking battery resting voltage, then measure voltage at the battery with the engine running at idle and at 2,000 rpm. Compare those readings to expected values. If voltage does not rise above roughly 13.5 volts with the engine running, the alternator may not be charging properly.
Load testing by switching on headlights, fan, and heated rear window while watching voltage behavior reveals how the alternator responds to sudden added demand. If voltage collapses significantly under load, that indicates inadequate output or a failing regulator.
- Resting battery voltage: 12.4 to 12.8 V is typical for a healthy battery.
- Running voltage: aim for 13.8 to 14.6 V with engine running.
- If available, use a clamp meter on the alternator output cable to measure charging current at idle and higher RPM.
Replacement Steps and What to Expect During Installation
Replacing an alternator on the 2002-2007 Impreza usually requires basic hand tools, a jack and stands if access is limited, and careful attention to belt routing. Begin by disconnecting the negative battery terminal to prevent shorts. Loosen the belt tensioner, remove the drive belt from the alternator pulley, and disconnect electrical connectors and the main output nut before unbolting the unit from its brackets.
Upon installing the new unit, ensure the output stud and plug align with the factory harness and that the belt is routed and tensioned correctly. After reconnecting the battery, start the engine and verify charging voltage and absence of warning lights. Expect 45 to 90 minutes for a DIY install depending on experience and access.
- Always disconnect the negative battery terminal first.
- Keep track of bolt locations and note any bracket spacers.
- Verify belt tension and pulley alignment before final test.
When to Consider Rebuilding Versus Replacing
Rebuilding an alternator can be a cost-effective choice if the core is in sound mechanical condition and only wear items like brushes, bearings, or the rectifier need replacement. For a 2002-2007 Impreza, examine the alternator for excessive shaft play, heavy corrosion, or damaged mounting ears before deciding to rebuild.
If the alternator has internal electrical faults such as a damaged stator or rotor, the time and parts required for a rebuild may exceed the value of a new or remanufactured unit. Consider local labor costs and parts availability when weighing rebuild versus replace decisions.
- Rebuild when mechanical core is sound and electrical wear parts are the only issues.
- Replace when core damage or extensive corrosion is present.
- Factor in labor and turnaround time for rebuilds versus replacement.
Understanding Warranty and Return Considerations
Warranty coverage varies by supplier and can cover defects in materials or workmanship for a fixed period. For alternators, look for clear terms on what is covered such as regulators, diodes, and bearing failures. Understand any requirements for core returns or installation verification that might be part of warranty claims.
Also check whether a warranty remains valid if you install the alternator yourself versus having a professional install it. Some warranties require proof of proper installation or may be voided by certain modifications. Keep documentation such as receipts and installation notes to streamline any potential claims.
- Confirm what specific components are covered under warranty.
- Note any core-return requirements or restocking rules.
- Keep installation records and photos to support warranty claims.
Still looking for the perfect fit?
Select your Subaru Impreza configuration to see the most relevant Alternators recommendations
How We Chose the Best 2002-2007 Subaru Impreza Alternator
We focused on alternators that match the 2002-2007 Subaru Impreza electrical and mechanical requirements and that offer reliable long-term performance. Key evaluation criteria included correct mounting and plug compatibility, rated amperage at idle and highway RPM, voltage regulation stability, and build quality including bearings and cooling. We also considered warranty coverage and availability of service parts such as rebuild kits and replacement regulators.To approximate real-world value we assessed typical durability features like stator and rotor construction, type of rectifier and regulator used, and expected heat dissipation. We filtered out units with unclear fitment information, missing connector details, or known widespread fitment complaints. Units intended only for heavy aftermarket modifications were excluded unless their electrical output and mounting were appropriate for factory Impreza setups. The final list prioritizes straightforward fitment, electrical compatibility, and long-term serviceability for the 2002-2007 Impreza.
Our full evaluation process is outlined in our review methodology.
FAQ
What are the most common alternator symptoms on a 2002-2007 Subaru Impreza?
Common symptoms include dashboard charging warning lights, dimming headlights at idle, a repeatedly dead battery, or unusual noises from the alternator area. These signs often indicate poor charging output, failing bearings, or regulator issues.
Can I test the alternator myself without special tools?
Yes. You can use a basic digital multimeter to check resting battery voltage and charging voltage with the engine running. For more detailed current measurements, a clamp meter or professional load tester is helpful but not strictly necessary for initial diagnosis.
Is it worth rebuilding an Impreza alternator versus buying a replacement?
Rebuilding can be worthwhile if the alternator core is mechanically sound and only wear components need replacement. If the core shows heavy corrosion, shaft play, or internal damage, replacement is often more reliable and faster.
How long does a typical alternator last on these Impreza models?
Alternator lifespan varies with driving conditions and maintenance but commonly ranges from several years to over a decade. Heavy urban driving, frequent short trips, or exposure to corrosive environments can shorten service life.
Will a higher-amperage alternator damage my Impreza's electrical system?
A properly designed higher-amperage alternator should not damage the vehicle if it includes correct voltage regulation. The key is stable voltage control. Avoid units that do not maintain correct charging voltage under varying loads.
Do I need to replace wiring or fuses when replacing the alternator?
Not always. Inspect the main output cable, connector terminals, and fusible links for corrosion or damage during replacement. Replace any degraded wiring or connectors to ensure reliable charging and prevent voltage drops.
Final Verdict
Prioritize fitment and stable voltage regulation when choosing an alternator for a 2002-2007 Subaru Impreza. Confirm mechanical mounting, connector compatibility, and amperage capacity that matches your vehicle's electrical demands. Expect tradeoffs between higher output and cost or complexity; select a unit that balances reliable charging performance with serviceability and warranty support.By focusing on correct fitment, solid build quality, and predictable voltage behavior, you can restore dependable charging to your Impreza and avoid repeat visits for charging-system problems.
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