Finding the best turbo kit for your Subaru STI involves balancing power gains, reliability, and budget. The maXpeedingrods TD05-20G Turbo stands out for its strong performance, while the A-Premium Complete Turbo Kit offers a more straightforward install for casual tuners. Keep in mind, major tradeoffs exist between cost, ease of installation, and long-term durability. Continue reading to see how each option stacks up and what fits your driving goals.
Key Takeaways
- Performance-focused turbo kits like the maXpeedingrods TD05-20G deliver significant power but may require additional tuning and upgrades.
- Complete turbo kits from brands like A-Premium offer a more plug-and-play experience, ideal for those seeking reliability without extensive modifications.
- Budget options such as the maXpeedingrods TD04L-13T provide decent gains but may fall short on durability for high-mileage or aggressive use.
- Upgrading other components like the clutch or oil feed lines is often necessary when choosing high-performance turbo kits.
- The best kit depends heavily on the intended use—daily driving, track days, or serious tuning—each has different priorities and tradeoffs.
More Details on Our Top Picks
maXpeedingrods TD05-20G Turbo Turbocharger for Subaru Impreza WRX STI EJ20 EJ25 2002 2003 2004 2005 2006
This turbo stands out for its compatibility with Subaru EJ20 and EJ25 engines from 2002-2006, making it a versatile choice for enthusiasts upgrading older models. Compared to the maXpeedingrods TD05 turbo, this model offers a high-quality ductile iron turbine housing resistant to temperatures up to 1292°F, which improves durability in demanding conditions. The forged aluminum compressor wheel enhances airflow and boost response, while the copper journal bearing adds to longevity. The turbo’s ability to support up to 380 hp makes it suitable for moderate to high-performance builds. However, installation might require some mechanical expertise, especially since the product details don’t specify if a direct bolt-on fit or additional modifications are needed, unlike some other kits. This pick makes the most sense for experienced tuners seeking a robust, high-capacity upgrade that balances performance and durability.
Pros:- High-temperature resistant ductile iron turbine housing
- Forged aluminum alloy compressor wheel for better airflow
- Supports up to 380 horsepower for versatile tuning
Cons:- Installation may require custom fabrication or professional tuning
- Lack of detailed instructions or fitment confirmation in product info
Best for: Advanced DIYers or professional tuners looking for a reliable, high-performance turbo upgrade for Subaru STI models from 2002-2006
Not ideal for: Casual enthusiasts or beginners who lack mechanical skills, as installation may require custom fitting and tuning
- Compatible Engines:EJ20, EJ25
- Years Supported:2002-2006
- Maximum Horsepower:380 hp
- Turbine Housing Material:Ductile iron
- Turbine Temperature Resistance:1292°F
- Compressor Wheel Material:Forged aluminum alloy
Bottom line: This turbo is ideal for experienced tuners seeking a durable, high-capacity upgrade for older Subaru STI models.
Action Clutch Stage 1 Clutch Kit (1OS) Compatible with Subaru WRX STI 2004-2021 2.5L DOHC (EJ257) Turbo AWD
This clutch kit offers excellent value for Subaru owners upgrading their stock or mildly tuned vehicles, supporting up to 385 HP/394 lb-ft torque. Its performance organic disc paired with a heavy-duty pressure plate ensures smooth engagement and reliable power transfer, making it a solid alternative to more expensive racing clutches like the Stage 2 kits. Compared with the Stage 2 clutch, this Stage 1 option is more suited for daily driving and light performance use, with less aggressive engagement and potentially longer lifespan. The kit is assembled and tested in the USA, providing peace of mind regarding quality and fitment. The drawback is that it might not handle extreme power increases or aggressive track use, unlike premium high-performance clutches. This makes it perfect for enthusiasts seeking a durable, OEM-like feel without overspending.
Pros:- Supports up to 385 HP and 394 lb-ft torque
- Made in the USA with quality control
- Includes full clutch kit with alignment tool and bearings
Cons:- Not designed for extreme power or aggressive driving
- Limited to light to moderate tuning applications
Best for: Daily drivers and mild performance enthusiasts seeking a reliable clutch upgrade without sacrificing comfort or longevity
Not ideal for: High-horsepower track or drag racers who need aggressive clutch engagement and maximum power capacity
Bottom line: This clutch kit offers a dependable, cost-effective upgrade for daily drivers and mild performance builds.
STAGE 2 CLUTCH KIT AND RACING FLYWHEEL compatible with 2004-2020 SUBARU STI WRX 2.5L TURBO EJ257
This California-made clutch and flywheel combo targets serious performance and racing drivers, emphasizing durability and precision fitment. Unlike the Stage 1 options, this kit is built with high-quality materials designed to withstand aggressive driving, high horsepower, and extended track use. The hand-assembled clutch ensures reliable engagement, while the racing flywheel improves throttle response and power transfer. It is ideal for those pushing beyond stock power levels, offering a longer-lasting solution than OEM parts. The downside is that the clutch may engage more aggressively, which could be less suitable for daily street driving, especially for those unfamiliar with high-performance clutch modulation. Compared to the Action Clutch Stage 1 kit, this setup provides superior performance at the expense of smoothness and comfort for everyday use.
Pros:- Made in the USA with high-quality materials
- Designed for high horsepower and aggressive use
- Includes racing flywheel for improved response
Cons:- More aggressive engagement may be difficult for beginners
- Less comfortable for daily street driving
Best for: Performance-focused drivers and racers needing a clutch system that can handle high horsepower and aggressive driving styles
Not ideal for: Casual or daily drivers seeking smooth, easy-to-drive clutch feel without the need for racing-grade durability
Bottom line: This clutch and flywheel combo is perfect for serious performance and racing builds demanding maximum durability.
IAG Performance Stock Location Turbo Oil Feed & AVCS Line for Subaru WRX 2006-14, STi 04-21, Legacy GT 05-09, Forester XT 04-08
This oil feed line addresses common issues found in OEM lines, such as cracking and clogging, making it a smart upgrade for reliability and engine protection. Constructed from braided stainless steel with Teflon lining, it resists high temperatures and prevents oil starvation, a problem that can occur with stock steel lines or clogged filters. Compared with the OEM rigid steel lines, this braided line is flexible and easier to install, with high corrosion resistance due to zinc-coated fittings. The product includes all necessary fittings and replacement banjo bolts, making it suitable for a variety of Subaru turbo setups. The main drawback is that it requires proper installation and possibly some custom fitting, which could be challenging for less experienced mechanics. Overall, a solid choice for long-term turbo and engine health.
Pros:- Braided stainless steel construction for durability
- Teflon inner lining resists high temperatures
- Includes multiple fittings and hardware for versatile installation
Cons:- Installation may require some mechanical skill
- No direct fitment confirmation without additional fitting checks
Best for: DIY Subaru owners and mechanics wanting a durable, reliable upgrade to their turbo oil feed system
Not ideal for: Casual owners who prefer plug-and-play solutions or are uncomfortable with custom installations
- Material:Stainless Steel braided
- Fitting Type:10mm Banjo, -4AN compatible
- Temperature Resistance:High
- Includes:Fittings, banjo bolts
Bottom line: This upgraded oil feed line is ideal for Subaru owners prioritizing engine longevity and reliable turbo oil supply.
maXpeedingrods Turbo Turbocharger Kit for Subaru Impreza WRX WRX Limited, STI/STI Limited 2011-2014, for WRX 2.5 GT 2009-2010 H4 2.5L, Basic VL Series
This turbo kit offers a straightforward upgrade path for Subaru WRX and STI models from 2011-2014, combining OEM reliability with enhanced performance. Designed as a direct replacement, it simplifies installation for enthusiasts who want a seamless upgrade without extensive modifications. The ductile iron turbine housing withstands high temperatures up to 1292°F, and the forged aluminum compressor wheel boosts airflow and response. Compared to more complex or high-end custom setups, this kit provides a balanced mix of reliability and performance at an accessible price point. The main limitation is that, being a basic VL series, it may not support extreme power levels or racing demands like more specialized aftermarket setups, but it suits most street and moderate tuning needs well. It’s a practical choice for daily drivers seeking a factory-like upgrade with added power.
Pros:- OEM direct replacement fitment
- High-temperature ductile iron turbine housing
- Forged aluminum compressor wheel for efficiency
Cons:- Limited support for extreme power levels
- Basic turbo design may lack advanced features of premium kits
Best for: Owners of 2011-2014 Subaru WRX/STI looking for a reliable, easy-to-install turbo upgrade with good performance gains
Not ideal for: High-horsepower racers or those wanting custom tuning for maximum tuning potential
Bottom line: This turbo kit is well-suited for daily drivers and moderate performance upgrades needing a simple, reliable solution.
maXpeedingrods TD05 Turbo Turbocharger for Subaru Impreza WRX STI EJ20 EJ25 2002-2006, with Billet Compressor Wheel, Street JD Series
This turbo stands out for its straightforward OEM replacement design, making it an excellent choice for those who want a hassle-free upgrade without modifications. Its silicon-molybdenum turbine housing and high-temperature resistance ensure durability under demanding conditions, while the billet compressor wheel improves airflow and boost response. Compared with the A-Premium Complete Turbocharger, this unit offers superior thermal resilience and a billet wheel that enhances overall efficiency. However, its focus on direct replacement means it may lack the performance tuning potential of more aggressive aftermarket kits. It’s ideal for enthusiasts seeking reliability and factory-like performance with minimal fuss, though it might not satisfy those chasing maximum power.
Pros:- Easy installation as a direct OEM replacement
- High-temperature resistant turbine housing
- Upgraded billet compressor wheel improves airflow
Cons:- Limited tuning potential for high horsepower goals
- Does not include supporting accessories or intercooler upgrades
Best for: Subaru owners wanting a direct OEM replacement that restores factory performance reliably.
Not ideal for: Tuning enthusiasts seeking maximum power gains or custom modifications, as this kit emphasizes OEM standards over aggressive tuning.
- Compatible Engines:2.0L, 2.5L H4 Turbo
- Turbine Housing Material:Silicon-molybdenum
- Maximum Operating Temperature:1832°F
- Compressor Wheel Material:Billet aluminum
- Installation Type:OEM replacement
Bottom line: This turbo is perfect for owners who want a straightforward, reliable upgrade that restores stock performance without complexity.
A-Premium Complete Turbocharger Turbo Kit with Gasket Compatible with Subaru Forester 2014-2018, WRX 2015-2020, H4 2.0L, MGT2259S
This kit offers a compelling blend of affordability and completeness, including gaskets and a reliable turbo model for late-model Subaru turbo engines. Its alloy construction and included gaskets help ensure a sealed, efficient operation, comparable to the maXpeedingrods Turbocharger for Subaru Forester, but at a lower price point. While it provides solid performance and ease of installation, it may lack the high-temperature durability or airflow optimization of premium aftermarket options. This makes it ideal for budget-conscious owners who want a full replacement kit, though those seeking extreme performance upgrades should consider more specialized kits.
Pros:- Complete with turbo, gaskets, and ready to install
- Affordable price point for a full turbo kit
- Includes high-quality alloy components
Cons:- Limited high-temperature resilience compared to premium models
- Potentially less boost response under extreme conditions
Best for: Budget-conscious Subaru owners needing a complete, reliable turbo upgrade for daily driving.
Not ideal for: High-performance tuners aiming for maximum horsepower or custom configurations, as this kit prioritizes affordability over extreme tuning capabilities.
- Vehicle Compatibility:Subaru Forester 2014-2018, WRX 2015-2020
- Turbo Model:MGT2259S
- Material:Alloy
- Gasket Included:Yes
- Warranty:One year unlimited miles
Bottom line: This turbo kit suits owners who want an all-in-one, cost-effective upgrade that restores factory-like performance for daily use.
maXpeedingrods Turbocharger Turbo for Subaru Forester Impreza WRX 2.0L TD04L-13T, for Saab 9-2X Aero DOHC, 49377-04300
This turbo offers a solid OEM replacement option for various Subaru and Saab models, with a focus on durability and ease of installation. Its ductile iron turbine housing withstands high temperatures up to 1292°F, similar to the maXpeedingrods TD05 Turbo, but optimized for smaller engine packages. The alloy turbine wheel enhances airflow and boost response, making it a dependable choice for daily drivers and mild tuning. However, it may fall short in extreme tuning scenarios where maximum airflow and thermal management are critical. This turbo appeals to those wanting a straightforward replacement at an affordable price, though it lacks the performance margins of more aggressive setups.
Pros:- High temperature resistance of turbine housing
- Easy installation as OEM replacement
- Good airflow with alloy turbine wheel
Cons:- Limited airflow capacity for high boost applications
- Not designed for maximum tuning potential
Best for: Owners seeking a reliable, direct OEM replacement for moderate daily driving and mild tuning.
Not ideal for: Extreme tuners or those aiming for high horsepower builds, since it targets durability over maximum flow capacity.
- Application:Subaru Forester XT, Impreza 2.0L, Saab 9-2X
- Turbine Housing Material:Ductile iron
- Maximum Operating Temperature:1292°F
- Compressor Wheel Material:Alloy
- OEM Part Numbers:49377-04300, 14412-AA360
Bottom line: This turbo is well-suited for owners needing a dependable, affordable OEM replacement for moderate driving conditions.
A-Premium Complete Turbo Turbocharger Kit, with Wastegate Actuator & Gasket, Compatible with Subaru Impreza 2008-2014, 2.5L, Replace# 14411AA700, 14411AA701
This kit caters to owners of 2.5L Subaru Impreza models seeking an affordable yet complete turbo upgrade, including wastegate and gaskets. Its high-grade alloy housing dissipates heat effectively, comparable to the maXpeedingrods TD05 Turbo, but tailored for the 2.5L engines of the late 2000s to early 2010s. Its included wastegate helps control boost levels reliably, making it suitable for daily driving. However, it may lack the durability or airflow capacity needed for aggressive tuning or high-boost applications. This kit suits owners who want a reliable, budget-friendly upgrade for stock or mildly tuned engines, but not those chasing maximum power.
Pros:- Includes wastegate actuator and gaskets
- Made of high-grade alloy for heat dissipation
- Suitable for stock or mildly tuned engines
Cons:- Limited airflow capacity for high-boost tuning
- Not designed for maximum horsepower builds
Best for: Owners of older Subaru Impreza 2.5L models looking for a reliable, complete turbo upgrade without high costs.
Not ideal for: High-performance enthusiasts aiming for maximum boost or custom tuning, as this kit emphasizes affordability and reliability over extreme power gains.
- Vehicle Compatibility:Subaru Impreza 2008-2014
- Turbo Model:VF48
- Material:High-grade alloy
- Wastegate Included:Yes
- Gasket Included:Yes
Bottom line: This turbo kit offers a dependable, budget-friendly upgrade for stock or lightly tuned 2.5L Subaru engines, ideal for daily drivers.
How We Picked
We evaluated these turbo kits based on performance potential, build quality, ease of installation, and long-term reliability. Cost was a factor, but not at the expense of critical features like compatibility and durability. We prioritized kits that are well-reviewed by users and supported by reputable brands, ensuring they suit both casual enthusiasts and serious tuners. The ranking reflects a balance between value and capability, aiming to recommend options for different driving needs and budgets.
Factors to Consider When Choosing Best Turbo Kits For Subaru STI
Choosing the right turbo kit for your Subaru STI requires understanding several key factors that influence performance, reliability, and compatibility. Beyond just horsepower gains, it’s essential to consider how the kit integrates with your existing setup and future plans. Here are some critical factors to weigh before making a decision.Performance Goals and Power Targets
Deciding whether you want a modest bump in horsepower or a significant upgrade influences your choice. Higher boost levels and larger turbochargers generally produce more power but demand supporting modifications like upgraded intercoolers, fuel systems, and engine internals. Setting clear goals helps prevent overspending on features you don’t need, or underbuying for your desired performance level.
Compatibility and Fitment
Ensure the turbo kit is compatible with your specific Subaru STI model and year. Some kits are designed for stock engines, while others are better suited for heavily modified setups. Compatibility issues can lead to installation headaches or even engine damage if overlooked. Always verify with the manufacturer or seller that the kit fits your car’s configuration.
Ease of Installation and Support
Some turbo kits come with comprehensive instructions and all necessary hardware, making DIY installation feasible for experienced enthusiasts. Others may require professional installation, which adds to costs. Consider the availability of technical support and replacement parts—kits from established brands tend to offer better support, reducing downtime and frustration.
Long-Term Reliability and Maintenance
A high-performance turbo is an investment that should last miles down the road. Cheaper or poorly manufactured kits may develop leaks, suffer from early wear, or require frequent repairs. Look for kits with proven durability, quality materials, and positive user reviews to avoid costly setbacks.
Price and Value
Budget constraints are real, but the cheapest option isn’t always the best. Balance initial cost with potential expenses for supporting modifications, tuning, and maintenance. Sometimes investing a bit more upfront yields better long-term performance and reliability, especially if you plan to push the car hard.
Frequently Asked Questions
Will installing a turbo kit void my Subaru STI warranty?
Installing a turbo kit can void parts of your Subaru’s warranty, especially if it leads to engine damage or if modifications are not done properly. Some dealers may be more lenient if the upgrade is performed by a certified professional and documented thoroughly. It’s wise to check your warranty terms and consult with your dealer before proceeding, especially if your car is still under factory coverage.
How much horsepower can I expect from these turbo kits?
Most turbo kits listed here can boost your Subaru STI’s power by 50-150 horsepower depending on the size of the turbo, supporting mods, and tuning. Kits like the maXpeedingrods TD05-20G are geared toward higher power levels, while more conservative setups like the A-Premium kits focus on reliability and moderate gains. Your specific results will depend on your engine’s condition and supporting upgrades.
Do I need to upgrade my fuel system when installing a turbo kit?
In many cases, yes. Increasing boost and power output typically demands more fuel, which can strain your stock fuel pump and injectors. Upgrading to higher-capacity fuel injectors, a high-flow fuel pump, or a standalone fuel system is advisable for sustained performance and engine safety. Proper tuning is essential to ensure the air-fuel mixture remains optimal.
Is it better to buy a complete turbo kit or piece together parts?
A complete turbo kit offers a more straightforward, often more reliable solution, especially for those new to turbo upgrades. It ensures all components are compatible and saves time during installation. Piecing together parts can sometimes save money but risks compatibility issues and extra effort sourcing individual components. For most users, a complete kit from a reputable brand provides better peace of mind.
How long does it typically take to install a turbo kit?
The installation duration varies based on experience and whether you’re doing it yourself or hiring a professional. For seasoned DIYers, it might take around 8-12 hours, while shops may complete it in 1-2 days. Keep in mind that supporting modifications, tuning, and break-in procedures can extend this timeline. Proper planning ensures a smoother install process and reliable results.
Conclusion
For those seeking the best overall performance, the maXpeedingrods TD05-20G Turbo is a compelling choice, especially for tuners aiming for high horsepower. Budget-conscious buyers will find the A-Premium Complete Turbo Kit offers reliable performance with less hassle. Beginners or those prioritizing ease of installation should consider plug-and-play options from reputable brands. Serious enthusiasts focused on long-term durability might lean toward higher-end setups with upgraded supporting components. Ultimately, your choice depends on your goals, budget, and willingness to support your upgrade with additional modifications.
