Nostrum Upgraded Direct Injector Kit - 2015-2021 WRX, 2014-2018 Forester XT

What sets Nostrum apart:

• +10% flow rate increase over stock 
• The only DI injector upgrade on the market for FA20F that works with stock ECU! 
• Set of 4 batched and serialized injectors with tuning data 
• E85 compatible 
• Direct Replacement - same outline as the OE injector
• OEM equivalent spray pattern 
• OEM ECU controlled (COBB tuning recommended) 

***Newly revised with a new part number. The same great performance you have come to expect from Nostrum, now with faster closing times!***

These injectors have been carefully developed to fit like factory and have no compatibility issues with a stock WRX FA20F engine, meaning there’s no need to worry about secondary injection controllers, fitting secondary injector hardware, filling meth tanks, or clogged meth injectors. Being that they are compatible with the stock ECU, they are fully tunable with Cobb or EcuTek. 

While increasing flow rate is critical to making more horsepower, there are other factors to consider when choosing fuel system upgrades. A bigger injector isn’t always a better injector! It can flow a large volume of fuel at WOT, but if the spray pattern is poor, you can expect poor idle quality, poor drivability, increased knock propensity, soot, NVH (noise vibration harshness,) and tuning difficulty. Additionally, the wrong spray pattern can result in liquid fuel impinging in the cylinder walls, causing oil dilution, which increases mechanical wear to internal engine components.

Nostrum has invested significant time and resources into acquiring the equipment and machinery necessary to deliver an OEM level of quality on our injectors. Our engineers design and develop injectors to optimally interact with engine air flow inside the combustion chamber to improve fuel evaporation and create a homogenous air-fuel mixture that results in a higher combustion quality. For you, this means that you can expect our injectors to perform at their absolute best regardless of what you are asking from them, from daily driver duty to setting new ¼ mile records.

Bundle up!

To take full advantage of your new injectors, we would recommend pairing them with Nostrum’s HPFP upgrade for the FA20. Flowing 40% more than the factory pump, the Nostrum HPFP will not only allow you to dial in more torque earlier in the rev range, but also gain peak horsepower by providing the upgraded injectors with the additional fuel that they need! Bundling the pump and injectors together saves you money! 

Peace of mind.

Every Nostrum manufactured part is backed by a limited lifetime warranty. Our products are comprehensive solutions that come complete with everything you need inside the box, including detailed installation instructions. Tuning guides are also available for your dealer or tuner. We have customer service and calibration engineers on staff to provide you with any support that you may need, from installation to tuning.

Contents: 

• Set of 4 injectors, tested & batched set with serial number
• Installation instructions 
• Tuning guide (Dealer & Certified Tuners only)** 
  **This guide only works with the current injector part number H720-1813 - Injectors purchased before March 1, 2024 with a part number of H703-1254 will use the previous tuning data, contact us for the correct guide! **
  

• 2015-2021 WRX FA20F (VA Chassis) 
• 2014-2018 Forester XT FA20E [2.0L turbo FA20 engine] 
• Note – not direct fit for 2022 model year WRX FA24F  

Frequently Asked Questions:

Q: Is a tune required? 

A: A tune is not required to start the vehicle, but to maintain drivability we recommend a tune after install. 

Q: Are these injectors Ethanol compatible?  

A: Yes, these injectors are fully ethanol compatible 

Q: How are you able to offer upgraded injectors for a lower cost than oem injectors? 

A: As the leader in high performance aftermarket DI fuel systems, Nostrum’s partnerships with OEM suppliers allow us to offer products that are competitive with Subaru dealer parts - without Subaru dealer markup. 

Q: Can I use these injectors in my BRZ’s FA20A engine?  

A: The FA20 found in the BRZ runs a completely different style of direct injector and are incompatible with our upgraded WRX injectors.