Choosing the right turbo kit for a Subaru STI involves balancing power gains, reliability, and budget. The BuyAutoParts 40-30187INVC stands out as the best overall due to its solid remanufactured design and compatibility. For those seeking a more complete upgrade, the A-Premium Complete Turbocharger Kit with Wastegate Actuator offers a reliable plug-and-play solution. However, buyers face tradeoffs like installation complexity, durability, and cost. Continue reading for a detailed breakdown of each option to find the best fit for your performance goals.
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Key Takeaways
- Top picks balance power output with long-term reliability, avoiding cheap parts that may fail prematurely.
- Complete kits with wastegate actuators tend to offer easier installation and better tuning options.
- Remanufactured options can save money but might have less consistent quality control compared to new units.
- Compatibility with specific Subaru STI models is critical to ensure proper fit and performance.
- Higher-priced kits often provide better durability, but some budget options still deliver solid gains for casual enthusiasts.
| BuyAutoParts 40-30187INVC Remanufactured Turbocharger for Subaru Impreza WRX STI 2008-2015 (Replaces IHI VF48) |  | Best Overall for Cost-Effective OEM Replacement | Replaces: IHI VF48 | Fitment: 2008-2015 Subaru Impreza WRX STI | Condition: Remanufactured | VIEW ON AMAZON | See Our Full Breakdown |
| A-Premium Complete Turbocharger Kit with Wastegate Actuator & Gasket for Subaru Impreza WRX (VF48) |  | Best for Complete Installation and Wide Compatibility | Turbo Model: VF48 | Includes: Wastegate actuator and gaskets | Material: Alloy | VIEW ON AMAZON | See Our Full Breakdown |
| maXpeedingrods Turbocharger for Subaru Impreza WRX/STI EJ20 EJ25 (2002-2006) |  | Best for High-Performance Upgrades with Custom Tuning | Max Horsepower: 380 hp | Turbine Housing Material: Ductile iron | Turbine Temperature Rating: 1292°F | VIEW ON AMAZON | See Our Full Breakdown |
| A-Premium TD04L-04HL Complete Turbocharger Turbo Kit |  | Best for Broad Compatibility and OEM Replacement | Part Model: TD04L-04HL | Material: Alloy | Gasket Included: Yes | VIEW ON AMAZON | See Our Full Breakdown |
| A-Premium RHF55 Complete Turbocharger Kit for Subaru Impreza 2004-2007 2.5L |  | Best for OEM Replacement with Impurity Prevention | Part Model: RHF55 | Material: Alloy | Wastegate: Included | VIEW ON AMAZON | See Our Full Breakdown |
| A-Premium RHF55 Complete Turbocharger Kit for Subaru Legacy Outback WRX STi EJ20 2003-2007 |  | Best Overall for Complete Compatibility and Reliability | Part Type: Turbo Assembly | Turbo Model: RHF55 | Material: Alloy | VIEW ON AMAZON | See Our Full Breakdown |
| Mustrod VF39 Turbocharger (RHF55, VA440028) Replacement for Subaru Impreza WRX STI 2.5L 2004-2007 |  | Best for OEM Fit and High-Altitude Stability | Brand: Mustrod | Turbo Model: RHF55 VF39 | OEM Part Numbers: 14411AA572 | VIEW ON AMAZON | See Our Full Breakdown |
| A-Premium Complete Turbocharger Kit with Wastegate Actuator & Gasket |  | Best for Wide Compatibility and Extended Durability | Turbo Model: RHF55 | Reference Numbers: VF52, 14411-AA800 | Wastegate Actuator Included: Yes | VIEW ON AMAZON | See Our Full Breakdown |
| turbo kit for subaru sti | Warranty | Material | Turbo Model | Gasket Included |
|---|---|---|---|---|
| BuyAutoParts 40-30187INVC Rema | 30 Day, unlimited-mileage | — | — | — |
| A-Premium Complete Turbocharge | One-year unlimited-mileage | Alloy | VF48 | — |
| maXpeedingrods Turbocharger fo | — | — | — | — |
| A-Premium TD04L-04HL Complete | 1 Year Unlimited-mileage | Alloy | — | Yes |
| A-Premium RHF55 Complete Turbo | 1 Year Unlimited-mileage | Alloy | — | Yes |
| A-Premium RHF55 Complete Turbo | 1 year unlimited mileage | Alloy | RHF55 | Yes |
| Mustrod VF39 Turbocharger | — | — | RHF55 VF39 | — |
| A-Premium Complete Turbocharge | — | Alloy | RHF55 | Yes |
More Details on Our Top Picks
BuyAutoParts 40-30187INVC Remanufactured Turbocharger for Subaru Impreza WRX STI 2008-2015 (Replaces IHI VF48)
This remanufactured turbocharger stands out for its focus on maintaining OEM specifications, making it a reliable choice for those seeking a straightforward replacement. Unlike the newer, more complex turbo kits like the A-Premium VF48 Kit, this unit is fully remanufactured with all bearings and seals replaced, ensuring consistent performance. The short 30-day warranty is a tradeoff, but its guaranteed fit and bench-tested quality make it ideal for budget-conscious enthusiasts. However, being remanufactured rather than new might raise concerns for buyers wanting maximum longevity. Overall, this pick is best suited for those prioritizing affordability and OEM fitment without the need for extensive modifications.
Pros:- Guaranteed exact fit for easy installation
- Fully remanufactured with all bearings and seals replaced
- Bench-tested and balanced for consistent performance
Cons:- Remanufactured units may have slightly less durability than new turbochargers
- Limited 30-day warranty compared to longer coverage on some competitors
Best for: Subaru STI owners seeking a dependable, budget-friendly OEM replacement with straightforward installation.
Not ideal for: Performance builders or those wanting a long-term upgrade with extended warranty coverage, as the 30-day warranty may be too limited.
- Replaces:IHI VF48
- Fitment:2008-2015 Subaru Impreza WRX STI
- Condition:Remanufactured
- Warranty:30 Day, unlimited-mileage
- Balancing:Bench-tested
- Seals & Bearings:All replaced
Our verdict“This turbo is a solid choice for owners needing a reliable, OEM-replacement turbocharger at an affordable price.”
A-Premium Complete Turbocharger Kit with Wastegate Actuator & Gasket for Subaru Impreza WRX (VF48)
This comprehensive turbo kit offers a full package, including a VF48 turbo, wastegate actuator, and gaskets, making it ideal for enthusiasts who want everything in one box. Compared with the BuyAutoParts remanufactured turbo, this kit provides new components designed for easier installation and reliable performance across multiple Subaru models. The inclusion of a wastegate actuator and gaskets simplifies the upgrade process, although the absence of an exhaust manifold could be a limitation for those seeking a fully assembled system. Its one-year unlimited-mileage warranty adds peace of mind, particularly for those planning a complete turbo upgrade. This option is best for DIYers or shops wanting a ready-to-install kit that covers most needs with minimal additional parts required.
Pros:- Complete kit with turbo, wastegate, and gaskets
- High-grade alloy housing for durability
- One-year unlimited-mileage warranty
- Fits a wide range of Subaru Impreza models
Cons:- Exhaust manifold not included, requiring additional parts
- Limited to specific Subaru models and years
Best for: Subaru owners looking for a full, ready-to-install turbo upgrade with broad model compatibility.
Not ideal for: Those seeking a highly durable, long-term performance solution or planning to upgrade to a custom exhaust manifold, as this kit lacks one.
- Turbo Model:VF48
- Includes:Wastegate actuator and gaskets
- Material:Alloy
- Warranty:One-year unlimited-mileage
- Vehicle Fitment:2008-2014 Subaru Impreza WRX
- Exhaust Manifold:Not included
Our verdict“Ideal for DIYers seeking an all-in-one turbo upgrade for multiple Subaru models without the need for custom fabrication.”
maXpeedingrods Turbocharger for Subaru Impreza WRX/STI EJ20 EJ25 (2002-2006)
This turbocharger supports up to 380 hp, making it a suitable choice for owners aiming to significantly boost their Subaru’s power. Unlike the BuyAutoParts remanufactured unit, which emphasizes OEM fit, this turbo is engineered for high performance with durable materials like ductile iron and a forged aluminum compressor wheel. While the journal bearing design is less advanced than ball bearings found in premium models, it offers solid heat resistance and airflow improvements for those comfortable with tuning. It lacks included gaskets or hardware, which might add to the installation effort. This pick is best for enthusiasts who want to push their EJ20 or EJ25 engines beyond stock power levels, accepting some additional setup work.
Pros:- Supports up to 380 hp for high-performance builds
- High-temperature resistant ductile iron turbine housing
- Forged aluminum compressor wheel for better airflow
- Compatible with EJ20 and EJ25 engines
Cons:- Journal bearing design is less advanced than ball-bearing units
- Lacks included gaskets and installation hardware
Best for: Performance-focused owners willing to tune their turbo and install additional components for maximum horsepower gains.
Not ideal for: Casual owners or those seeking a plug-and-play replacement, as this turbo requires more technical knowledge and additional parts.
- Max Horsepower:380 hp
- Turbine Housing Material:Ductile iron
- Turbine Temperature Rating:1292°F
- Compressor Wheel:Forged aluminum alloy
- Compatible Engines:EJ20, EJ25
- Bearing Type:Copper alloy journal bearing
Our verdict“Best suited for experienced tuners aiming for maximum power with custom setup and tuning.”
A-Premium TD04L-04HL Complete Turbocharger Turbo Kit
This turbo kit offers a versatile upgrade option for various Subaru and Saab models, especially those with TD04L-04HL units. Compared with the BuyAutoParts remanufactured turbo, it provides a full assembly with gaskets included, streamlining the installation process. Its compatibility across multiple Subaru models, including Forester and Baja, makes it a flexible choice for owners with different vehicles. The one-year unlimited-mileage warranty covers typical wear, but its fitment is limited to specific 2006-2007 Subaru models, which could be restrictive for some owners. If your vehicle matches its specs, this kit can serve as a reliable OEM-style replacement with minimal fuss.
Pros:- Complete kit with gaskets included
- Broad compatibility with Subaru and Saab models
- 1-year unlimited-mileage warranty
- OEM-like quality and fit
Cons:- Limited fitment to specific 2006-2007 models
- No mention of performance tuning potential
Best for: Owners of Subaru or Saab models needing a broad-compatible, ready-to-install turbo replacement.
Not ideal for: Performance enthusiasts seeking high-horsepower upgrades, as this is more of a stock replacement than a performance boost.
- Part Model:TD04L-04HL
- Material:Alloy
- Gasket Included:Yes
- Warranty:1 Year Unlimited-mileage
- Compatible Vehicles:2006-2007 Subaru Baja, Forester; Saab 9-2X
- Interchange Part Numbers:49377-04553, 14411AA532
Our verdict“A dependable, OEM-style replacement for owners with compatible Subaru or Saab vehicles, prioritizing ease and broad fitment.”
A-Premium RHF55 Complete Turbocharger Kit for Subaru Impreza 2004-2007 2.5L
This RHF55 turbo kit includes wastegate and gaskets, designed for Subaru Impreza 2.5L models from 2004 to 2007. Compared with the BuyAutoParts remanufactured turbo or high-performance options, this kit emphasizes impurity prevention through its gaskets, which help keep contaminants out of the compressor and oil lines. The alloy construction offers decent durability, but the limited fitment window means owners of newer or older models should look elsewhere. It provides a straightforward, OEM-like upgrade for those wanting to restore stock performance with added reliability. Still, its alloy build may not last as long as OEM units, especially under high boost conditions.
Pros:- Complete kit with wastegate and gaskets
- Gaskets help prevent impurities entry
- One-year unlimited-mileage warranty
- Fits 2004-2007 Subaru Impreza 2.5L models
Cons:- Limited to specific model years
- Alloy construction may be less durable than OEM units
Best for: Owners of 2004-2007 Subaru Impreza seeking a reliable, OEM-style turbo replacement with improved sealing and impurity control.
Not ideal for: Power tuners or performance builders aiming for high horsepower gains, since this is geared towards stock or near-stock restoration.
- Part Model:RHF55
- Material:Alloy
- Wastegate:Included
- Gasket Included:Yes
- Vehicle Fitment:2004-2007 Subaru Impreza 2.5L
- Warranty:1 Year Unlimited-mileage
Our verdict“A suitable OEM replacement option for Subaru owners prioritizing reliability and impurity prevention within its fitment window.”
A-Premium RHF55 Complete Turbocharger Kit for Subaru Legacy Outback WRX STi EJ20 2003-2007
This kit stands out for offering a comprehensive solution with included gaskets and a one-year unlimited-mileage warranty, making it a strong choice for owners of EJ20-powered Subaru models from 2003-2007. Compared with the Mustrod VF39, it covers a wider range of models and engine variants, providing peace of mind with gaskets that help prevent impurities and boost longevity. The tradeoff is that vehicle fitment needs careful verification, and the lack of customer ratings makes assessing real-world performance more difficult. This kit is ideal for enthusiasts seeking a reliable, all-in-one upgrade that minimizes installation surprises.
Pros:- Includes turbocharger and gaskets for a complete upgrade
- Compatible with a wide range of EJ20 engines
- One-year unlimited-mileage warranty
Cons:- Vehicle fitment must be carefully verified before purchase
- No available customer rating data for real-world reliability
Best for: Owners of Subaru Legacy, Outback, WRX, or STi models from 2003-2007 looking for a complete, plug-and-play turbo upgrade.
Not ideal for: Those with newer Subaru models or engines outside the EJ20 series, as fitment and performance benefits may not translate.
- Part Type:Turbo Assembly
- Turbo Model:RHF55
- Material:Alloy
- Gasket Included:Yes
- OEM Part Number:VF37
- Vehicle Fitment:Subaru EJ20, EJ20G, EJ20E engines 2003-2007
- Item Weight:19.25 pounds
- Warranty:1 year unlimited mileage
Our verdict“This kit is best suited for owners seeking a reliable, all-in-one turbo upgrade for older EJ20 Subaru models with peace of mind from a comprehensive package.”
Mustrod VF39 Turbocharger (RHF55, VA440028) Replacement for Subaru Impreza WRX STI 2.5L 2004-2007
Compared with the A-Premium kits, the Mustrod VF39 offers a direct OEM replacement, making it highly appealing for owners who want a straightforward fit for 2004-2007 WRX STI models. It emphasizes improved throttle response and smooth acceleration, especially at high altitudes, which is a key advantage over generic aftermarket options that may not optimize performance at elevation. However, being an aftermarket brand, it lacks the assurance of Subaru’s OEM standards, and fitment verification through OE numbers is essential. This product is ideal for those who prioritize OEM-like reliability and precise fitment, especially at high altitudes.
Pros:- Direct OEM fit replacement matching OE part number
- Improves throttle response and acceleration
- Stable power output at high altitudes
Cons:- Requires OE number verification before purchase
- Not an Subaru OEM part, aftermarket brand
Best for: Owners of 2004-2007 Subaru Impreza WRX STI seeking a reliable, OEM-like turbo replacement that enhances throttle response and altitude performance.
Not ideal for: Owners of newer models or those wanting a turbo upgrade beyond OEM specifications, as this is tailored specifically for earlier STI versions.
- Brand:Mustrod
- Turbo Model:RHF55 VF39
- OEM Part Numbers:14411AA572
- Compatibility:2004-2007 Subaru Impreza WRX STI
- Weight:15.18 lbs
- Dimensions:11.02 x 10.24 x 9.45 inches
Our verdict“This turbo makes sense for owners who want a precise, OEM-like replacement that performs reliably at high elevations but are cautious about aftermarket parts.”
A-Premium Complete Turbocharger Kit with Wastegate Actuator & Gasket
This kit excels in providing a full package that includes wastegate and gaskets, suitable for multiple Subaru 2.5L models from 2008-2014 and 2005-2009, respectively. Its high-grade alloy housing promotes heat dissipation, giving it an edge over simpler replacements like the VF39, especially for owners concerned about long-term durability. Compared to the other A-Premium kit for earlier models, this version covers more recent Subaru vehicles, making it a versatile choice. The main limitation is that it doesn’t include installation hardware or instructions, which could complicate DIY installs. It’s ideal for owners who want a comprehensive upgrade with extended service life.
Pros:- Includes wastegate actuator and gaskets for complete upgrade
- High-grade alloy for heat dissipation and durability
- Compatible with multiple Subaru 2.5L models
Cons:- Limited to specific Subaru models and years
- No installation hardware or detailed instructions included
Best for: Owners of Subaru Impreza, Legacy, Outback, or WRX models from 2008-2014 seeking an all-in-one turbo kit with added durability and compatibility.
Not ideal for: Those with older Subaru models outside the specified years or who prefer a DIY-focused kit with detailed instructions and hardware included.
- Turbo Model:RHF55
- Reference Numbers:VF52, 14411-AA800
- Wastegate Actuator Included:Yes
- Gasket Included:Yes
- Material:Alloy
- Compatible Vehicles:Subaru Impreza 2008-2014, Legacy 2005-2009, Outback 2005-2009, WRX 2013-2014
Our verdict“This kit is an excellent choice for Subaru owners wanting a durable, all-in-one turbo upgrade for recent models with reassurance from high-quality materials.”
How We Picked
I based the rankings on a combination of performance metrics, build quality, ease of installation, and value. Each turbo kit was evaluated for its compatibility with Subaru STI models, durability over time, and potential power gains. I prioritized products that offer reliable performance without excessive complexity or cost, making sure to include options suitable for different budgets and experience levels. The ranking reflects a balance between quality and affordability, highlighting which kits deliver the best overall performance and value for Subaru STI owners.| turbo kit for subaru sti | Turbo Model |
|---|---|
| BuyAutoParts 40-30187INVC Rema | — |
| A-Premium Complete Turbocharge | VF48 |
| maXpeedingrods Turbocharger fo | — |
| A-Premium TD04L-04HL Complete | — |
| A-Premium RHF55 Complete Turbo | — |
| A-Premium RHF55 Complete Turbo | RHF55 |
| Mustrod VF39 Turbocharger | RHF55 VF39 |
| A-Premium Complete Turbocharge | RHF55 |
Factors to Consider When Choosing Turbo Kit For Subaru Sti
Selecting the right turbo kit for your Subaru STI involves understanding key factors that influence performance, reliability, and compatibility. Considering these elements can help you avoid common pitfalls such as mismatched parts or underperforming units. A well-chosen kit should meet your current needs while allowing room for future upgrades without excessive rework. Keep in mind that the most expensive option is not always the best for every driver, especially if you’re new to turbo upgrades or on a tighter budget.Compatibility and Fitment
Ensuring the turbo kit matches your specific Subaru STI model and engine type is fundamental. Kits designed for different years or engine variants may not fit properly or could lead to performance issues. Always verify the product’s compatibility list and consult your vehicle’s manual or a professional if uncertain. Incorrect fitment can cause significant engine damage or reduce the lifespan of your upgrade, making this a priority step in your decision process.
Performance Gains and Power Goals
Determine what level of power increase you desire—whether it’s a modest boost for daily driving or a substantial increase for track use. Some kits prioritize quick spool and responsiveness, ideal for street performance, while others focus on maximum horsepower for racing. Keep in mind that higher gains often require supporting modifications like upgraded intercoolers or exhaust systems. Balancing your power goals with your budget and driving style is key to choosing the right kit.
Build Quality and Durability
The longevity of your turbo kit depends heavily on the quality of components used. OEM-grade or high-quality castings and bearings tend to last longer and perform more consistently over time. Cheaper, poorly manufactured units may offer initial gains but risk failure sooner. Consider the reputation of the brand and read user reviews to gauge real-world durability, especially if you plan frequent or high-stress driving.
Ease of Installation and Tuning
Some kits are designed for straightforward bolt-on installation, making them suitable for DIY enthusiasts, while others may require professional setup and tuning. Kits with integrated wastegate actuators and comprehensive hardware typically simplify the process. Keep in mind that proper tuning after installation is vital to maximize performance and protect your engine from running lean or overboosting. Factor in installation costs and your mechanical skill level when selecting a kit.
Budget and Cost-Effectiveness
Turbo kits vary widely in price, from budget-friendly options to high-end setups. Cheaper kits may deliver decent power gains but can suffer in longevity or require additional upgrades soon after installation. Conversely, investing in a premium kit usually provides better reliability, tuning flexibility, and long-term performance. It’s important to weigh initial costs against potential maintenance, durability, and your overall performance aspirations to make a wise purchase.
Frequently Asked Questions
Will a turbo kit for Subaru STI require additional modifications?
Most turbo kits will benefit from supporting upgrades such as an upgraded intercooler, exhaust system, and fuel management to achieve optimal performance. Some kits are designed as complete solutions, reducing the need for extra parts, but others may require custom tuning or additional hardware. It’s wise to plan for these potential upgrades to prevent bottlenecks and ensure your engine runs smoothly under increased boost pressure.
How long does a turbo kit typically last on a Subaru STI?
The lifespan of a turbo kit depends on the quality of components, driving style, and maintenance. Well-made kits from reputable brands can last upwards of 100,000 miles if properly maintained, including regular oil changes and tuning checks. Cheaper or poorly manufactured units might fail much sooner, especially if subjected to aggressive driving or insufficient cooling. Investing in a high-quality kit and proper care can significantly extend its service life.
Is a remanufactured turbo better than a new one?
Remanufactured turbochargers often come at a lower price point and can be a good choice for budget-conscious buyers, but they may have variability in quality and longevity. New units typically offer better consistency and longer lifespan, especially if sourced from reputable manufacturers. If reliability and maximum performance are priorities, investing in a new turbo kit might be the wiser choice, though remanufactured options can still deliver decent results if carefully selected.
How difficult is it to install a turbo kit myself?
The difficulty varies depending on the kit’s complexity and your mechanical skills. Basic bolt-on kits with integrated hardware are generally manageable for experienced DIY enthusiasts, especially with proper instructions. More advanced setups, especially those requiring custom tuning or engine modifications, are best left to professionals. Always consider your comfort with tools and mechanical work before attempting a turbo installation, and factor in the cost of professional tuning if needed.
When should I consider upgrading my turbo kit?
If you notice signs of wear, such as decreased boost pressure, excessive smoke, or unusual noises, it may be time for an upgrade or rebuild. Also, if you’re aiming for higher power levels or better responsiveness, replacing your current turbo with a larger or more efficient model can help. Upgrading is also worth considering if you plan to add supporting modifications like upgraded intercoolers, fuel systems, or exhaust components to maximize overall performance.
Conclusion
For casual drivers or those new to turbo upgrades, a complete, plug-and-play kit like the A-Premium Complete Turbocharger Kit with Wastegate Actuator offers a straightforward upgrade path. Enthusiasts seeking the best balance of reliability and performance should consider the BuyAutoParts 40-30187INVC Remanufactured Turbocharger as a solid overall choice. For those with a higher budget and a focus on durability, premium options with high-grade components will deliver long-term value. Beginners or those on a strict budget should prioritize kits that are easier to install and tune, while experienced owners can push for custom or high-performance setups. Ultimately, the ideal turbo kit aligns with your driving goals, budget, and willingness to maintain your Subaru STI.
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