Best WRX Turbo Upgrade Brands: Garrett, BorgWarner, and Precision Turbo Explained

The Subaru WRX has earned a dedicated following among automotive enthusiasts for its rally-bred heritage, responsive boxer engine, and immense tuning potential. While the factory turbocharger provides a solid foundation, upgrading the turbo is one of the most effective ways to unlock significant horsepower gains and transform the driving experience. With many aftermarket brands competing for attention, three names consistently rise to the top: Garrett, BorgWarner, and Precision Turbo. Each brings distinct engineering philosophies, performance characteristics, and application strengths. This guide provides a deep dive into what makes each brand unique, which models suit specific goals, and how to choose the right turbo for your WRX build.

Garrett Turbochargers: Proven Performance and Broad Compatibility

Garrett Motion has been a dominant force in turbocharging for decades, supplying original equipment to major automakers and leading the aftermarket performance segment. Their turbos are known for robust construction, consistent quality, and a wide range of airflows to match nearly any power target. For WRX owners, Garrett offers a reliable path from mild street upgrades to all-out track builds.

Technology and Features

Garrett’s GTX series uses billet compressor wheels and advanced aerodynamics to improve efficiency and reduce spool time compared to older cast wheel designs. The GTXGen2 lineup, for example, incorporates a slender aerodynamically optimized wheel profile that delivers exceptional flow without sacrificing response. High-temperature alloys and dual ball-bearing cartridges ensure durability under sustained boost and high exhaust gas temperatures. Many Garrett units also feature integrated recirculation valves and compatibility with modern engine management systems.

  • Garrett GTX2867R Gen2 – This is a favorite for daily-driven WRXs aiming for 350–400 wheel horsepower. Its 52mm inducer and 67mm exducer provide quick spool, often reaching full boost before 3500 rpm. The compact size retains low-end torque while offering a substantial mid-range punch. Ideal for street enthusiasts who want responsive power without excessive lag.
  • Garrett GTX3071R Gen2 – Stepping up, the GTX3071R supports 400–500 wheel horsepower. It uses a 56mm inducer wheel and a 71mm exducer, striking a balance between flow capacity and spool speed. This turbo pulls hard through the mid-range and top end, making it suitable for aggressive street or occasional track use. It pairs well with a full exhaust, upgraded intercooler, and larger injectors.
  • Garrett GTX3576R Gen2 – For those seeking 500–600 wheel horsepower, the GTX3576R delivers. Its larger compressor and turbine wheels shift the power band higher, requiring a built engine and substantial supporting modifications. It shines on road courses and drag strips where top-end power is prioritized.

Strengths and Considerations

Garrett’s biggest advantage is widespread availability and extensive technical support. Tuning shops worldwide are familiar with Garrett turbo maps, making calibration straightforward. The dual ball-bearing core reduces friction and enhances transient response, which is critical for Subaru’s boxer engine with its long exhaust runners. However, the higher cost of ball-bearing cartridges and the need for a proper oil feed restrictor (especially with journal bearing variants) should be factored into the budget. Overall, Garrett offers a time-tested formula that works well for both beginners and experienced builders.

Explore the full Garrett product line

BorgWarner Turbochargers: Innovation and Rapid Spool

BorgWarner Inc. is a global leader in turbocharging technology, and its EFR (Engineered For Reliability) series has gained a strong following among Subaru enthusiasts. The company’s focus on aerodynamics and emissions-conscious design translates into turbos that spool quickly and maintain high efficiency across a broad operating range. BorgWarner’s commitment to research and development makes them a top contender for WRX builds that demand instantaneous throttle response.

Advanced Aerodynamics and Materials

BorgWarner’s EFR turbos feature a patented Gamma-Ti turbine wheel made from titanium aluminide. This material is 50% lighter than traditional Inconel, dramatically reducing rotational inertia and allowing the turbo to respond faster to exhaust pulses. The compressor wheels use a blended airfoil design to maximize flow and efficiency. Additional innovations include a ceramic dual ball-bearing cartridge for low friction, an integrated wastegate option for simpler installation, and a ported shroud to reduce surge at low boost levels. These features make BorgWarner turbos particularly attractive for engines that require quick spool, such as the WRX’s 2.0L or 2.5L turbocharged platform.

  • BorgWarner EFR 6258 – Designed for lower power targets (350–400 wheel horsepower), the 6258 delivers street-friendly response. Its 57mm compressor inducer and 58mm turbine exducer allow boost to build as early as 3000 rpm. This turbo suits mild builds with factory internals and bolt-on supporting upgrades.
  • BorgWarner EFR 7163 – The 7163 is a sweet spot for many WRX owners seeking 400–500 wheel horsepower. The 71mm compressor wheel and 63mm turbine wheel provide excellent mid-range torque while still pulling hard to redline. It is often paired with a built short block, upgraded fuel system, and a large front-mount intercooler. Spool is noticeably quicker than comparably sized Garrett GTX models, thanks to the lightweight titanium turbine.
  • BorgWarner EFR 8374 – For power levels exceeding 550 wheel horsepower, the 8374 offers massive flow capacity. Its 83mm inducer and 74mm exducer require a built engine, ported heads, and extensive supporting modifications. Response remains respectable for its size due to the low inertia wheel, but peak power comes on later in the rpm band. This turbo is best reserved for serious competition cars.

Strengths and Considerations

The main draw of BorgWarner EFR turbos is spool speed—they often reach full boost several hundred rpm earlier than competitors in the same airflow range. This characteristic translates to a more exhilarating daily driving experience and faster track acceleration out of corners. However, the titanium turbine wheel is expensive, and replacement parts can be hard to source. Additionally, the integrated wastegate options may not suit every WRX manifold configuration; some owners prefer an external gate for precise boost control. Despite the higher initial cost, BorgWarner turbos are extremely durable, and their efficiency can reduce exhaust gas temperatures under sustained load, benefiting engine longevity.

Learn more about BorgWarner EFR technology

Precision Turbo: Race-Bred Design for Maximum Power

Precision Turbo & Engine has established a reputation in the high-performance community by focusing on extreme power applications. Their turbos are engineered to support the kind of builds that push four-digit horsepower figures, but they also offer models well-suited for strong street cars. Precision Turbo’s commitment to customization and performance has made them a staple in drag racing, road racing, and dyno competitions. For WRX owners aiming for the highest power levels, Precision Turbo is often the go-to choice.

Customization and High-Flow Engineering

Precision Turbo offers both journal bearing and ball-bearing options across many of their product lines. Their Gen 2 series features billet compressor wheels with extended tip technology, reducing turbulence and increasing flow efficiency. The ability to choose compressor housing outlets, turbine housing AR (aspect ratio), and even wastegate porting allows owners to dial in the turbo for their specific engine setup and power goals. Precision also provides complete turbo kits for many Subaru models, simplifying the installation process. Their products are designed to handle sustained boost pressures up to 35 psi or more, making them ideal for builds with built internals and aggressive tune maps.

  • Precision 5858 Gen 2 – This 58mm inducer / 58mm exducer turbo is a popular choice for 450–550 wheel horsepower. It offers a very wide power band, with respectable spool characteristics suited for street driving. The 5858 Gen 2 features a billet wheel and a heavy-duty double-ball bearing cartridge for minimal lag. It pairs well with a rotated mount kit and external gate setup on Subaru WRX models.
  • Precision 6266 Gen 2 – The 6266 steps up flow capacity for 550–700 wheel horsepower. A 62mm inducer and 66mm exducer support high boost levels and strong top-end pull. This turbo is common in builds running E85 fuel and upgraded fuel systems. Spool is later than smaller options, but the reward is exceptional peak power. Many owners use it for highway pulls and roll racing.
  • Precision 6870 Gen 2 – For the truly ambitious, the 6870 can support over 800 wheel horsepower. Its 68mm inducer and 70mm exducer move massive air volume, requiring a fully built motor, ported heads, and an advanced standalone ECU. Response is intentionally shifted toward the upper rpm range, making this turbo best for cars that rarely see stop-and-go traffic.

Strengths and Considerations

Precision Turbo’s primary strength lies in the sheer power they can unlock. The modular design allows owners to fine-tune the turbo to their specific engine characteristics, whether that means faster spool or higher peak flow. However, achieving those high numbers demands comprehensive supporting modifications: larger injectors, high-pressure fuel pump, upgraded intercooler, full exhaust, and robust engine management. Installation can be more involved than other brands, often requiring custom piping or rotated inlet setups. Cost is also higher, but for those chasing records or serious track performance, the investment is justified.

Precision Turbo’s customer support and availability of replacement parts further solidify their place in the top tier.

Browse Precision Turbo’s product catalog

Comparing the Three Brands for Your WRX Build

Choosing between Garrett, BorgWarner, and Precision Turbo ultimately depends on your power goals, driving style, and budget. Below is a direct comparison of key factors to help guide your decision.

Response and Spool

BorgWarner leads the pack in transient responsiveness due to the lightweight titanium turbine and advanced bearing design. Garrett’s GTX line with ball bearings is a close second, offering excellent spool for their flow class. Precision Turbo’s larger units trade some low-end response for top-end flow, though their ball-bearing Gen 2 models still provide competitive spool times for their power range.

Maximum Power Potential

Precision Turbo offers the highest absolute power ceilings, with turbos capable of supporting over 1000 wheel horsepower. Garrett’s largest models (e.g., GTX4088R) also reach high power levels but are less common on Subaru builds. BorgWarner’s EFR turbos top out at around 700–800 wheel horsepower with the 9180 model, which is ample for most street and track builds.

Installation Ease

Garrett turbos typically require the least modification thanks to their standard T3 or T4 flange patterns and widespread availability of adapter kits. Many BorgWarner EFR units come in a T4 or T3 twin-scroll housing that fits common aftermarket manifolds. Precision Turbo often necessitates a rotated or forward-facing mount, which can require custom intercooler piping and relocation of ancillary components. For a simple bolt-on experience, Garrett is the most straightforward.

Cost and Value

Garrett GTX turbos range from approximately $1,200 to $1,800, offering good value for the performance. BorgWarner EFR units are generally $1,500 to $2,400 due to the titanium wheel and advanced engineering. Precision Turbo Gen 2 models start around $1,300 and climb past $2,500 for the largest units. High-end Precision models also require additional expenditure for rotated kits and external wastegates, increasing overall project cost.

Tuning and Support

All three brands have extensive support from professional tuners. Garrett has the most universal compressor maps, making it easier to find off-the-shelf tunes. BorgWarner requires careful matching to the engine’s airflow characteristics to fully exploit its fast spool. Precision Turbo turbos demand a custom tune to safely handle their high boost capabilities, but a skilled tuner can achieve remarkable results.

Supporting Modifications and Practical Considerations

Upgrading the turbo is only one part of a successful WRX build. The engine management system must be reflashed or replaced with a standalone unit to control fuel and ignition timing. Fuel system upgrades (larger injectors and a high-flow fuel pump) are mandatory once exceeding approximately 350 wheel horsepower. An upgraded intercooler—whether front-mount or larger top-mount—helps reduce intake air temperatures. The exhaust system, from downpipe to cat-back, should be free-flowing to minimize backpressure.

For power levels beyond 400–450 wheel horsepower, a built short block with forged pistons, stronger rods, and upgraded bearings is strongly recommended to prevent engine failure.

The choice between a twin-scroll vs. single-scroll turbo housing also matters. Subaru’s unequal-length headers benefit from twin-scroll setups that separate exhaust pulses, improving spool and reducing turbo lag. BorgWarner and Garrett both offer twin-scroll T4 housings that match well with equal-length headers many builders use. Precision Turbo offers both options, but the twin-scroll configuration may require additional fabrication.

Conclusion

Selecting the right turbocharger for your Subaru WRX is a decision that should align with your performance goals, budget, and willingness to invest in supporting modifications. Garrett provides a reliable, well-tested option with broad compatibility and moderate cost, making it a safe choice for first-time builders and street-focused enthusiasts. BorgWarner stands out for its lightning-fast spool and advanced materials, delivering an exhilarating driving experience with excellent efficiency. Precision Turbo leads in maximum power potential and customization, catering to owners who want to push their cars to the limit on the track or drag strip.

Regardless of your choice, proper installation and professional tuning are essential to realizing the full benefits of your new turbo. Consult with experienced Subaru tuners, study compressor maps, and plan your upgrade path carefully. With the right turbo from Garrett, BorgWarner, or Precision Turbo, your WRX can deliver a level of performance that transforms every drive into an unforgettable experience.