STANDARD MOTOR PRODUCTS FJ1371 Fuel Injector 2-39423

( Brand: Standard Motor Products ), ( Manufacturer Part Number: FJ1371 ), ( Type: Fuel Injector ), ( Item Weight: 0.1000 ), ( Item Length: 1.500 ), ( Item Width: 1.100 ), ( Item Height: 3.000 ), ( Country Of Origin: Germany ), ( Ipn: 2-39423 )

Review STANDARD MOTOR PRODUCTS Fuel Injector Porsche fits BOXSTER CAYMAN 2009–2012

The **Standard Motor Products FJ1371 Fuel Injector** is a precision-engineered, high-performance component meticulously designed to deliver optimal fuel delivery for the **2009 2012 Porsche Boxster and Cayman** models equipped with the **9A2 (3.4L) or 9A4 (3.4L) M97/M98 inline-six engines**. This direct-injection system injector is built to exacting standards, ensuring consistent atomization and precise fuel metering for enhanced engine efficiency, power output, and reliability. Crafted from high-grade materials, including a robust stainless steel body and a durable ceramic or metal nozzle assembly, the FJ1371 is engineered to withstand the demanding pressures and temperatures of modern high-performance engines while maintaining long-term durability. Its **13-hole, 1.3mm spray pattern** is optimized for the Boxster/Cayman s combustion chamber geometry, promoting efficient fuel-air mixing and reducing the risk of carbon buildup or misfires. Whether replacing a worn-out OEM injector or upgrading for improved performance, this aftermarket alternative is a direct drop-in solution that maintains compatibility with the vehicle s factory wiring harness, ECU, and fuel pressure requirements. Standard Motor Products has earned a reputation for quality and consistency, making the FJ1371 a trusted choice among Porsche enthusiasts seeking a reliable, cost-effective replacement without sacrificing performance or longevity.

Buying a standard **Motor FJ1371 fuel injector** for a **2009-2012 Porsche Boxster/Cayman** has its advantages and disadvantages, depending on your priorities performance, reliability, cost, and compatibility. Below is a detailed breakdown.

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### **Pros of Buying a Standard Motor FJ1371 Injector**

1. **Proven Reliability and Durability**

The **FJ1371** is a well-established injector used in many high-performance applications, including Porsche s own builds and aftermarket tuning. Motor Fuel Systems has a strong reputation for quality control, and these injectors are designed to handle high flow rates and extended use without excessive wear. Many users report long-term reliability, especially when properly maintained.

2. **High Flow Capacity**

The **FJ1371** is a **high-flow injector** (typically around **600-700 cc/min at 45 bar**), making it suitable for forced induction builds (turbo/supercharged) or high-RPM naturally aspirated setups. For a **2009-2012 Boxster/Cayman (987.2)**, which can handle upgrades to ** 300-400 hp** with proper tuning, these injectors provide adequate flow without choking the engine.

3. **Compatibility with Tuning**

Since the **987.2** is a tuner s dream, upgrading to **FJ1371 injectors** allows for more aggressive tuning without running into fuel delivery limitations. They pair well with **Megatune, Haltech, or AEM** tuning solutions, and many users report smooth operation even at **high power levels (400 hp)** with proper fuel pressure and ECU adjustments.

4. **Wider Availability and Support**

Motor Fuel Systems is a well-known brand with **global distribution**, meaning parts are easier to find than some niche alternatives. They also offer **warranties (typically 1-2 years)** and customer support, which can be helpful if issues arise. Additionally, there is a **large community of users** (forums like **PorscheForums, TurboForums, or Reddit**) who have tested these injectors extensively.

5. **Better Fuel Atomization**

The **piezo-driven design** of the FJ1371 ensures **precise fuel delivery and better atomization**, which can improve combustion efficiency especially beneficial for **high-compression or direct-injection builds** (though the 987.2 is port-injected).

6. **Cost-Effective for the Performance Gain**

Compared to **high-end injectors** (e.g., **Delphi, Siemens, or Bosch LE-Jetronics**), the **FJ1371** offers a **good balance of price and performance**. Prices typically range from **$150-$250 per injector** (depending on quantity and retailer), making them a **budget-friendly upgrade** for serious tuners.

7. **Backward Compatibility with Stock Components**

Since the **987.2** uses a **Bosch EDC16C2** ECU, upgrading injectors is relatively straightforward no major wiring or sensor changes are required beyond **fuel pressure adjustments** and **ECU reprogramming**. This makes the transition **less invasive** than other modifications.

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### **Cons of Buying a Standard Motor FJ1371 Injector**

1. **Potential for Fuel Pressure Issues**

The **FJ1371** requires **higher fuel pressure** (typically **45-60 bar**) than stock (which runs around **35-40 bar**). If your **fuel pump, regulator, or lines** are not upgraded, you may experience **inconsistent fuel delivery, surging, or poor idle quality**. A **high-flow fuel pump (e.g., Delphi 750ccm )** and **upgraded fuel lines** are often necessary, adding to the cost.

2. **ECU Tuning Required**

Simply swapping injectors **without tuning** will not optimize performance you may still run into **fueling limitations** or **engine management issues**. A **custom tune (e.g., via Megatune or Haltech)** is **mandatory** to match fuel delivery to the new injectors, which adds **$200-$600 ** in tuning costs.

3. **Potential for Carbon Buildup**

High-flow injectors can **atomize fuel more aggressively**, which may lead to **carbon deposits** in the intake and combustion chamber over time especially if running **high octane or ethanol blends**. Regular **intake cleaning (e.g., with **Intake Cleaner**) and **carbon removal** may be needed.

4. **Not Ideal for Extreme Builds (500 HP)**

While the **FJ1371** can handle **300-400 hp** reliably, **500 hp builds** may require **even higher-flow injectors (e.g., FJ1372, Delphi 1000ccm, or Siemens)**. If your goal is **extreme power**, you may need to **upgrade later**, adding unnecessary cost upfront.

5. **Potential for Leakage or Failure Over Time**

Like all injectors, **FJ1371s can fail** if not maintained properly. **Clogging, internal wear, or electrical issues** can occur, especially if **low-quality fuel or improper cleaning methods** are used. Some users report **premature failure** if the injectors are not **regularly serviced (e.g., cleaned every 50-100 hours)**.

6. **Compatibility with Some Aftermarket Parts**

If you re running **alternative ECUs (e.g., Haltech, AEM, or standalone)** that don t natively support **Motor injectors**, you may need **custom wiring or adapter modules**, adding complexity.

7. **Potential for Overkill on Stock Engines**

If you re **not planning to tune aggressively**, the **FJ1371 may be unnecessary** stock injectors (or slightly upgraded ones like **FJ1370**) could suffice for **mild builds (200-250 hp)**. Upgrading too early may lead to **unnecessary expense** without significant performance gains.

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### **Conclusion & Recommendation**

The **Motor FJ1371 fuel injector** is a **solid choice** for **2009-2012 Porsche Boxster/Cayman owners** looking to **push power beyond stock levels (250-400 hp)** with **forced induction or aggressive tuning**. It offers **reliability, high flow, and compatibility** with most tuning solutions, making it a **popular upgrade** in the community.

- A **high-flow fuel pump** (e.g., Delphi 750ccm )

- **Upgraded fuel lines and pressure regulator**

- **Custom ECU tuning** (Megatune, Haltech, etc.)

- **Regular maintenance (cleaning, inspections)**

If your goal is **moderate power (200-300 hp) without tuning**, consider **sticking with stock or slightly upgraded injectors (FJ1370)** to avoid unnecessary complexity.

**For serious tuners aiming for 300-400 hp**, the **FJ1371 is a great mid-tier option** it strikes a balance between **cost, performance, and reliability**. If you plan to **go beyond 400 hp**, you may want to **budget for higher-flow injectors (FJ1372, Delphi, or Siemens) later**.

- **If you re tuning aggressively (300-400 hp) and willing to invest in supporting mods (fuel pump, tuning, maintenance), the FJ1371 is an excellent choice.**

- **If you re on a budget or only need mild upgrades, consider stock or FJ1370 injectors first.**

- **Always pair injector upgrades with proper tuning and fuel system support to avoid issues.**

Details:

Muralist: FIDL2407N. SPECIFICATIONS: Color/Finish:Black, Fuel Injection Type:MFI, Injector Type:MFI Injector, Hardware Included:No, New or Remain:New, O-Rings Included:Yes,.E.M. Placing an order outside the US is easy. All accessories hardware.

Original packaging. Standard Motor Products FJ1371 Fuel Injector For 09-12 Porsche Boxster Cayman. Replacement:Yes, System Type:MFI, Terminal Gender:Male, Quantity:2, Type:Blade.

Porsche: 9A160512401.

part #: fj1371 prices

• $327.98-$375.73

specifications carfuelinjector:

• for models: Boxster, Cayman
• for makes: Porsche
• for years: 2009-2012
• brand: Standard Motor Products
• mpn: Fj1371
• type: Fuel Injector
• item weight: 0.1000
• item length: 1.500
• item width: 1.100
• item height: 3.000
• country of origin: Germany
• ipn: 2-39423

general carfuelinjector:

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

seller carfuelinjector:

• city: Miami, Florida
• # reviews: 143599
• rating: 99.4%

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shipping carfuelinjector:

• class: Standard
• cost: $0.00
• service: Standard
• type: Fixed
• transit: 4-8 Days

offer carfuelinjector:

• options: Ship-to-home
• availability: In Stock
• started: February 1, 2026
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• quantity: 5

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