1. Fuel Injectors Offers
  2. sku: 15185353883893752
  3. TURBO AUTOPARTS FI09650

TURBO AUTOPARTS FI09650 Fuel Injectors Highz 650CC 2.5

fits model: Ej25, Sti, Gt, Legacy. make: Subaru. year: 2004–2006.

Fi09650 Turbo Autoparts 4- Fuel Injectors 650cc For 2004-2006 Subaru Sti Legacy Gt 2.5 Ej25 Highz

( Brand: Turbo Autoparts ), ( Manufacturer Part Number: FI09650 ), ( Manufacturer Warranty: 1 Year ), ( Fitment Type: Performance/custom ), ( Type: Fuel Injector ), ( Size: 650cc/min, 60lbs/hr ), ( Resistance: High Ohms ), ( Fuel Type: Gasoline ), ( Item Weight: 12 Oz )

Review TURBO AUTOPARTS Fuel Injectors 650cc Subaru 2.5 Highz fits LEGACY EJ25 STI GT 2004–2006

The **Turbo Fi09650 High-Z Fuel Injectors** are a precision-engineered upgrade designed specifically for the high-performance demands of the **2004 2006 Subaru STI GT 2.5L (EJ25) turbocharged engine**, delivering a seamless blend of reliability, efficiency, and raw power. These **650cc injectors** are meticulously crafted to meet the aggressive fueling requirements of a heavily modified or naturally aspirated EJ25, ensuring consistent atomization and optimal combustion even under extreme boost levels and high-RPM conditions. Built with **high-zinc (High-Z) material**, these injectors feature a robust internal structure that resists corrosion and wear, extending their lifespan while maintaining precise fuel delivery critical for preventing carbon buildup, misfires, or detonation in a turbocharged application. The **650cc flow rate** strikes an ideal balance for both stock and modified setups, providing ample fuel capacity for aggressive turbocharging setups (up to **20 psi**) without the risk of fuel starvation or lean-running issues that plague smaller injectors. Engineered with **high-response solenoids** and **low-resistance coils**, these injectors activate instantly, reducing lag and ensuring smooth throttle response essential for a sport-tuned STI that demands instant power delivery. Whether paired with a **stock turbo, a larger turbo kit, or a high-flow intake**, these injectors integrate flawlessly with modern ECU tuning solutions, allowing for precise fuel trims and adaptive learning curves to maximize performance while protecting engine longevity. Built to withstand the demands of **forced induction**, these injectors are a game-changer for STI enthusiasts looking to push their engines beyond factory limits without compromising on reliability or drivability.

### Pros and Cons of Buying Turbo FI09650 Fuel Injectors for a 2004-2006 Subaru STI (2.5L EJ25 High-Z)

#### **Pros:**

1. **Improved Performance and Power** Upgraded injectors can deliver more fuel efficiently, allowing for better throttle response, increased horsepower, and torque, especially when paired with a turbo setup. The FI09650 injectors are designed to handle higher fuel flow rates, which can help unlock additional power from the EJ25 engine.

2. **Better Fuel Atomization** High-quality injectors like the FI09650 provide finer fuel atomization, leading to more complete combustion. This can improve engine efficiency, reduce carbon buildup, and enhance overall drivability.

3. **Compatibility with Modifications** If you ve already made other upgrades (e.g., turbo, ECU tune, or intake/exhaust modifications), these injectors can help prevent fuel starvation, which is a common issue when pushing the engine beyond stock limits.

4. **Durability and Reliability** The FI09650 injectors are known for their robust construction, often featuring high-flow paths and corrosion-resistant materials. This can extend the lifespan of your injectors compared to stock or lower-quality aftermarket options.

5. **Easier Maintenance and Cleaning** Some aftermarket injectors come with easier access for cleaning or replacement, reducing long-term maintenance hassles. The FI09650 injectors are designed with serviceability in mind.

6. **Support for Forced Induction** The EJ25 High-Z in your STI is a turbocharged engine, and these injectors are rated for higher fuel flow, making them a logical choice if you re running boost or planning to do so in the future.

7. **Wider Availability of Parts and Support** These injectors are well-documented in the tuning community, meaning you ll find ECU maps, tuning support, and replacement parts more easily than with niche or custom injectors.

---

#### **Cons:**

1. **Cost** Upgraded injectors like the FI09650 are significantly more expensive than OEM injectors (typically $200 $400 per injector, depending on quantity and retailer). For a 4-cylinder engine, this can add up quickly, especially if labor costs are factored in.

2. **ECU Tuning Required** Simply swapping injectors without adjusting the ECU can lead to fuel starvation (too little fuel) or flooding (too much fuel). You ll need a tune to match the injectors flow rate to your engine s demands, which adds another expense (typically $100 $300 for a professional tune).

3. **Potential for Overkill** If your engine isn t heavily modified (e.g., stock turbo, no forced induction, minimal tuning), these injectors may be more fuel than you need. Stock injectors can handle modest power levels (around 300 350 hp with a tune), so upgrading may not be necessary unless you re pushing 400 hp.

4. **Installation Complexity** Replacing injectors requires removing the intake manifold, fuel rails, and injectors themselves. This is a moderately involved job that may require disassembling other components (e.g., throttle body, sensors). If you re not comfortable with mechanical work, labor costs will add up.

5. **Risk of Fuel System Issues** Upgrading injectors may expose weaknesses in other parts of your fuel system, such as the fuel pump, fuel pressure regulator, or fuel lines. You may need to upgrade these components as well to avoid fuel delivery problems.

6. **Learning Curve for Tuning** If you re not familiar with ECU tuning, you ll need to research or consult a tuner to ensure the injectors are properly calibrated. Mismatched tuning can lead to poor performance, rough idling, or even engine damage.

7. **Potential for Leaks or Failures** Higher-flow injectors can sometimes develop leaks or clogging issues if not maintained properly. They may also require more frequent cleaning or replacement than stock injectors.

---

### **Conclusion:**

Upgrading to **FI09650 fuel injectors** for your 2004 2006 Subaru STI (EJ25 High-Z) is a **strong choice if you re pushing significant power (400 hp) or planning to run forced induction**. They offer better fuel delivery, durability, and compatibility with modifications, but they come with a higher upfront cost and require proper tuning. If your build is still in its early stages or you re only targeting modest power gains (300 350 hp), stock injectors or slightly upgraded options (e.g., 440cc 500cc injectors) may suffice and save you money.

For most **high-performance EJ25 builds**, these injectors are a worthwhile investment, but they re not essential unless you re aiming for serious power or reliability at high boost levels.

---

### **Recommendation:** 1. **If your goal is 300 350 hp with stock turbo:**

- Consider **stock injectors or slightly upgraded options (e.g., 440cc 500cc)** to save money while still improving performance. A tune will still be necessary, but the cost will be lower.

2. **If you re targeting 400 hp or running boost:**

- **Proceed with the FI09650 injectors** (or equivalent high-flow options like **FI09655 or FI09660**). Pair them with a **professional ECU tune**, a **high-flow fuel pump**, and ensure your fuel system (lines, regulator, etc.) can handle the increased flow.

3. **If you re unsure about tuning:**

- Work with a **reputable tuner** who specializes in EJ25 engines. They can help determine if injectors are necessary or if other upgrades (e.g., turbo, intercooler, exhaust) are the limiting factors.

4. **Budget Considerations:**

- If cost is a concern, prioritize **tuning and fuel system upgrades** before injectors. Sometimes a well-tuned stock setup can outperform a mismatched injector swap.

5. **Long-Term Reliability:**

- Invest in **high-quality injectors and a reliable fuel system** to avoid future issues. Poor fuel delivery can lead to detonation, poor performance, or even engine damage.

**Final Verdict:** The FI09650 injectors are a **solid upgrade for serious EJ25 builds**, but they re not a "set-and-forget" solution. Proper tuning and supporting modifications are critical to success. If you re committed to high performance, they re a worthwhile investment; otherwise, evaluate whether your power goals justify the cost.

Details:

Flow matched to 1%-1.5% discrepancy. 4 Turbo Fuel injectors 650cc FOR 2004 2006 Subaru STi Legacy 2.5 EJ25 HighZ, Every fuel injector got tested by ASNU machine before delivery!!, : Flow rate: 750cc/min at 3 BAR, 72lb/hr. 2004 2006 Subaru STI EJ25. 2004 2006 Legacy EJ25.

High resistance. Injector type: side feed.

part #: fi09650 price

  • $94.16

specifications carfuelinjector:

  • for models: Ej25, Sti, Gt, Legacy
  • for makes: Subaru
  • for years: 2004-2006
  • brand: Turbo Autoparts
  • mpn: Fi09650
  • manufacturer warranty: 1 Year
  • fitment type: Performance/custom
  • type: Fuel Injector
  • size: 650cc/min, 60lbs/hr
  • resistance: High Ohms
  • fuel type: Gasoline
  • item weight: 12 Oz

shipping carfuelinjector:

  • carrier: USPS
  • cost: $0.00
  • class: Standard, Expedited
  • type: Fixed
  • transit: 4-10 Days
  • service: USPS Ground Advantage, USPS Priority Mail

seller carfuelinjector:

  • # reviews: 1624
  • city: Renton, Washington
  • rating: 90.5%

general carfuelinjector:

  • Air Fuel Delivery > Fuel Injection Parts > Fuel Injectors
  • condition: Remanufactured

offer carfuelinjector:

  • started: March 9, 2026
  • sold: 0
  • best offers: True
  • options: Ship-to-home
  • quantity: 5
  • availability: In Stock

returns carfuelinjector:

  • policy: Returns Accepted
  • paid by: Seller
  • time: 30 Days

payments carfuelinjector:

  • other
  • wallet: Google-pay
  • credit card: Mastercard
for models: ej25, sti, gt, legacy, for makes: subaru, for years: 2004-2006, manufacturer warranty: 1 year, fitment type: performance/custom, type: fuel injector, size: 650cc/min, 60lbs/hr, resistance: high ohms, fuel type: gasoline, item weight: 12 oz,
category: auto parts > air fuel delivery > fuel injection parts > fuel injectors, sku: 15185353883893752,
Turbo Autoparts FI09650 Is Similar To:
carfuelinjector logo
1 offer $94.16 USD
  • Remanufactured. Offer #1 priced at $94.16 + $0.00 shipping estimate = $94.16* total. Injector type: side feed. 2004-2006 Subaru STI EJ25.FREE SHIPPING

Copyright © carfuelinjector.com