Introduction to the Garrett GTX3584RS Turbocharger Upgrade

The Garrett GTX3584RS turbocharger is a proven upgrade for enthusiasts targeting 100+ horsepower gains on a variety of platforms, from inline-six and V8 engines to high-performance four-cylinders. This turbine is part of Garrett’s GTX line, known for its advanced aerodynamics and dual ball-bearing cartridge, which reduce spool time and improve transient response compared to older journal-bearing units. A full upgrade does not end with the turbo itself – supporting modifications, labor, and tuning are required to safely extract the extra power. This expanded cost breakdown covers everything you need to budget for a successful installation, with typical price ranges and factors that can shift total expenditure.

Understanding the Garrett GTX3584RS Turbo

Before examining costs, it is important to understand what makes the GTX3584RS a strong candidate for a 100+ horsepower increase. The turbo features a 58mm inducer compressor wheel (84mm exducer) and a 68mm turbine wheel, with a .82 or .96 A/R housing option. The ball bearing center section allows the turbo to spool roughly 500–1,000 RPM sooner than a comparable journal-bearing unit, which is critical for street-driven cars.

Key specifications include a maximum flow rate of approximately 75 lb/min, supporting up to 750–850 horsepower on many engines when properly fueled and tuned. The GTX3584RS is often used in single-turbo setups on engines like the 2JZ, RB26, LS series, and BMW S54/N54. Its durable investment-cast turbine housing and billet compressor wheel provide consistent performance even under sustained high boost.

Typical retail pricing for the bare turbo ranges from $1,200 to $1,800, depending on the A/R housing chosen and whether you buy from an authorized distributor or a reseller. Hunting for deals can save up to 20%, but be cautious about counterfeit units – always purchase from trusted suppliers like Garrett Motion or certified dealers such as Garrett’s official site or MAPerformance.

Supporting Modifications Breakdown

The GTX3584RS can significantly increase airflow and fuel demand. Without properly upgraded supporting components, you risk detonation, component failure, or leaving power on the table. Below is a detailed look at each required modification and its cost.

Upgraded Intercooler

A larger intercooler is crucial to reduce intake air temperature (IAT) after the compressor has heated the air. Stock intercoolers usually become heat-soaked beyond 400 wheel horsepower. A front-mount intercooler with a core size around 24”x12”x3” and bar-and-plate construction is ideal. Expect to spend $500 to $1,000 on a quality unit from brands like Mishimoto, Treadstone, or CXRacing. Many kits include piping and connectors; custom fabrication may be needed for engine bays with unique layouts, adding another $200–$400 in welding costs.

Fuel System Enhancements

Gaining 100+ HP often pushes factory fuel injectors and pumps beyond their limits. For a gasoline engine, you will likely need:

  • High-flow fuel injectors – target injectors in the 1,000–1,300cc/min range. Costs range from $300 to $800 for a set of six or eight. Brands like Injector Dynamics, Bosch, or Siemens Deka are reliable.
  • Fuel pump upgrade – an in-tank Walbro 255 lph or 450 lph pump costs $100–$200. For higher boost (>20 psi), a surge tank and external pump may add $400–$800.
  • Fuel pressure regulator and lines – if converting to return-style fuel system, budget $150–$300 for a regulator, lines, and fittings.

The total fuel system upgrade can run $550 to $2,100 depending on the scope. It is the most critical safety item – do not skip it.

Performance Exhaust System

Restrictive stock exhausts hinder flow and increase backpressure, which can cause boost creep or limit power. A 3-inch (or 3.5-inch) mandrel-bent exhaust from turbo-back (or downpipe-back) is standard. Costs vary:

  • Downpipe alone: $150–$400
  • Full cat-back or turbo-back system (with high-flow catalytic converter or test pipe): $600–$1,200
  • Custom fabrication: $100–$300 for welding and labor

Stainless steel systems are more expensive than aluminized steel but last longer. Expect to pay around $700–$1,200 for a complete high-quality exhaust.

ECU Tuning

The GTX3584RS demands a custom calibration. A simple piggyback or generic flash tune rarely matches the turbo’s airflow curve. Professional tuning on a chassis dynamometer (dyno) costs $400–$800 for a session, plus the cost of a standalone ECU or flash tool if your ECU is locked. Options include:

  • Standalone ECU (e.g., Haltech, AEM Infinity, Link, or MaxxECU): $1,000–$2,500 including tuning
  • ECU flash & tuning software (e.g., HP Tuners, Cobb Accessport): $600–$1,200 for the device and license
  • Custom remote tuning: $300–$600 if you have a supported platform

Do not attempt to run the GTX3584RS without a proper tune. Even a low-boost start-up map can cause engine damage. The cost of a tune is a fraction of what a rebuild costs.

Labor Costs for Installation

Labor rates vary by region and shop specialty. A reputable performance shop charges $100 to $200 per hour. The GTX3584RS installation can take 10–20 hours for a competent shop, depending on the vehicle’s engine bay space and difficulty of access to turbo mounting bolts, oil lines, and exhaust manifold. Average labor cost: $500 to $1,500.

If you are doing the work yourself, you save this expense but need special tools (torque wrenches, socket sets, possibly a lift or floor jack). First-time turbo swaps often take a weekend on a lift. Factor in the value of your time and the risk of mistakes – a mis-tightened oil feed line can lead to oil starvation and turbo failure.

Additional Expenses to Anticipate

Several smaller items add up:

  • Gasket and seal kit: turbo manifold gasket, downpipe gasket, and oil return gaskets – $100–$200
  • Hardware and fittings: oil feed/return lines (AN fittings, braided hose), wastegate actuator fittings, clamps – $50–$150
  • Wastegate: if your GTX3584RS comes with an internal gate, you may still need an external wastegate for precise boost control above 25 psi. A good Tial or Turbosmart unit costs $200–$400 plus welding for a dump tube.
  • Heat management: turbo blanket, downpipe wrap, or intake heat shield – $50–$150
  • Dyno tuning session: included above, but if you want a separate dyno calibration (some shops charge extra if not included in tune price), budget $300–$600

Total miscellaneous items: $500–$1,500 depending on wastegate and additional fabrication.

Total Estimated Costs for a 100+ HP Upgrade

Adding everything together, the investment to upgrade to a Garrett GTX3584RS and achieve a reliable 100+ horsepower increase can be summarized in the table below. Note that prices are averages and can vary ±30% based on brand choices and geographic location.

  • Turbocharger: $1,200 – $1,800
  • Intercooler: $500 – $1,000
  • Fuel system: $550 – $2,100
  • Exhaust: $700 – $1,200
  • ECU tuning: $600 – $1,500 (including tuning tool or standalone)
  • Labor: $500 – $1,500
  • Additional parts: $500 – $1,500

Total range: roughly $3,500 to $7,500. The lower end ($3,500) assumes DIY labor, using a flash tune, and sourcing some used parts (e.g., intercooler). The upper end ($7,500) reflects a shop-installed kit with a standalone ECU, external wastegate, and new premium components. Most enthusiasts will fall between $4,500 and $6,000 for a fully sorted setup.

It is important to budget an extra 10–15% for unexpected issues like broken exhaust manifold studs, need for stronger engine mounts, or upgrading the clutch – especially if your vehicle is manual. A clutch upgrade for 500+ whp can cost $500–$1,200.

Performance Trade-Offs and Considerations

With 100+ HP gains, the driving experience changes significantly. The GTX3584RS spools well on medium-displacement engines (3.0–4.0L) but can feel laggy on smaller engines if the .82 A/R is not enough. Choosing the .96 A/R housing moves peak boost later but unlocks up to 40 more horsepower at high RPM. For street cars, .82 is recommended to retain low-end response. Also, consider that the increased power may exceed the capability of your differential, axles, or transmission – budgetary planning should include a safety margin for driveline upgrades.

Fuel quality is critical. Lower octane or pump gas with ethanol blends requires careful tuning to avoid knock. Many high-HP builds use E85, which demands even larger injectors and pump capacity. If you plan to run E85, add at least $400–$800 for a flex-fuel sensor and larger fuel system components.

Where to Buy and Build Recommendations

To maximize value, purchase the GTX3584RS from an authorized Garrett distributor. Garrett’s official dealer locator is a good starting point. Online retailers like ATP Turbo and Pure Turbos also offer complete upgrade kits that include manifold flanges, gaskets, and oil lines. For a turnkey solution, consider a “turbo kit” specific to your vehicle model, which may bundle the GTX3584RS with intercooler, piping, wastegate, and downpipe – prices range from $2,500 to $4,000, sometimes reducing overall cost by 15–20% compared to piecemeal purchases.

If you are new to turbo upgrades, join a community forum for your engine platform (e.g., Supraforums or E90Post). Member reviews and dyno threads often reveal real-world costs and pitfalls. Another excellent resource is High Performance Academy’s turbo selection guides, which explain compressor maps and how to match the GTX3584RS to your engine’s displacement and power goals.

Conclusion

Upgrading to a Garrett GTX3584RS turbo and achieving 100+ reliable horsepower requires a clear budget of $3,500 to $7,500, with the majority spent on the turbo itself, fuel system, and tuning. The cost is justified by the quality materials and proven air-flow capability – many enthusiasts report daily-driveable power gains exceeding 120 wheel horsepower on pump gas. Always plan for supporting mods first; an under-built fuel system or untuned ECU will not only limit performance but can destroy your engine. With careful shopping and professional tuning, the GTX3584RS upgrade transforms your vehicle into a formidable performer on both street and track.