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STRATIFIED X4tra Fuel System - EcoBoost 2.0L/2.3L

STRATIFIED X4tra Fuel System - EcoBoost 2.0L/2.3L

Starting at: $1,500.00USD

95l lb/hr Injectors require an In-Tank fuel pump upgrade

Check the fuses in your fuse box and match to images below

Cable used to connect to your laptop

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**We fully support our products. When you purchase our Aux Fuel Kits you will receive a $100 tune credit covering the Aux Fuel Tuning Fee**

The Ultimate Fueling Solution for the 2.0/2.3 EcoBoost




  • EcoBoost 2.0T/2.3T powered vehicles
  • E85 blended fuel
  • Full E85 (OEM LPFP needs to upgrade past 400whp)
  • Over 650 WHP (can upgrade to larger injectors for more power)



Why Our 4-Port?

The Stratified X4tra 4-Port Fuel System not only addresses both the HPFP and injector shortcomings with a single, plug-and-play auxiliary fuel system, but it also improves upon our existing Stratified Xtra 2-Port Fuel System by providing more precise as well as increased fuel delivery to each cylinder! This is a highly recommended fueling solution when running 500+ WHP with an upgraded turbocharger. 

We made sure to pay attention to the little details such as how the air-fuel mixture would be entering the engine. Our system features injectors that are oriented at an angle towards the cylinder head that sprays with a split stream pattern to ensure even fuel distribution to each intake valve. This also ensures that each valve is getting the same amount of cleaning from the fuel.

Furthermore, the ports on the spacer are also angle-matched to sit between the intake manifold and the cylinder head to keep the transition of airflow toward the engine as smooth as possible. This not only ensures proper air-fuel mixing but also ensures that you don't lose any power to abrupt transitions that most straight port intake spacers struggle with.


The first graph below is a comparison between the AFRs (air-fuel ratios) and fuel trims for our X4tra 4-Port Fuel System and Xtra 2-Port Fuel System. The second graph below is a comparison of the ignition corrections between the same kits. As you can see AFRs and fuel trims are significantly more consistent and fluctuate less with the 4-Port kit. This along with faster tip-in fuel delivery from injecting directly into the cylinder ports has allowed us to reduce the amount of knock seen!

Our X4tra Fuel System has helped propel the Focus ST platform past 500whp and into the 11s!


Why Aux Fuel?

The OEM DI (direct injection) fuel system in the 2.0 EcoBoost can deliver fuel for up to around 375 WHP, but after this point, it starts to run out in two main areas: The HPFP (high-pressure fuel pump), and fuel injectors. The HPFP is the first to lose pressure and this can cause driveability issues such as sputtering or not running smoothly to redline. The DI injectors are soon to follow in terms of flow limitation especially if fuel pressure drops. This can put the motor at risk of running lean and is especially dangerous when running a bigger turbo! Upgrades for these components, however, are both expensive and in the case of the HPFP simply not available.

Auxiliary fuel can provide that extra volume of fuel to relieve some of the load that high horsepower builds demand from the OEM fuel system. It also helps run a richer mixture which keeps detonation and heats down which are the major factors that contribute to piston and engine failure. 

Additionally, aux fuel has much better fuel metering and atomization than a WMI system - it is a proper fuel system that is also more reliable.

Direct-injected cars offer an increased level of efficiency and capabilities. However, the fuel systems are very expensive and difficult to upgrade when you want to extract more power from the engine. Many OEMs opt to run both port and direct injection systems on their high-power vehicles. This way you keep the DI system's efficiency and only use the port aux system at wide open throttle.

Below is an image that is all too common of fuel pressure drops even when the 2.0 EcoBoost is making around 360whp without auxiliary fueling.

Direct-injected (DI) cars offer an increased level of efficiency, however, they also come with an increased amount of build-up on the intake valves. Running auxiliary port injection is the perfect solution for this!

Below is a comparison of the cleanliness of intake valves when running pure DI and running it with auxiliary port injection.


Check out our walk-around video of the 4-Port system which explains some of the features mentioned above:


Features & Benefits


Installing the X4tra Fuel System is simple (simpler than a water-methanol injection kit) and it requires no splicing or soldering. It only requires a modification to the intake manifold. No extra tanks or reservoirs or pressure regulators are needed.



Here are some photos of our early prototype installed on our very own Stratified Tuned Focus ST!



Once installed, the system should be tuned (tuning is needed!) to work in tandem with the OEM fuel delivery system for seamless and safe power delivery - especially when using ethanol-based fuels that have higher fuel flow requirements. 

The controller is programmed using a serial/DB9 port. If you don't have a USB converter cable already make sure you purchase that option. 


Turn-around time: Up to 15 business days


Limited Warranty

This Stratified product is warranted against defects in materials and workmanship for ninety (90) days from the date of purchase. During the warranty period, Stratified will repair, or at its option replace at no charge, components that prove to be defective. The product must be returned, shipping prepaid, to a Stratified facility. This limited warranty does not apply if the product is damaged by accident or misuse. The foregoing warranty is in lieu of all other warranties expressed or implied including but not limited to any implied warranty of merchantability, fitness, or adequacy for any particular purpose or use. Stratified Automotive Controls LTD. is not responsible for any fines, injuries, or damages incurred as a result of the installation or use, or misuse of our products. It is the complete responsibility of the purchaser of such products to ensure that they are used in a legal, safe, and appropriate manner.







  • Model: Ecoboost2023_X4tra_Fuel
  • Shipping Weight: 3.5kgs
  • 0 Units in Stock
  • Manufactured by: Stratified Automotive Controls


  • Caleb L. - May 17, 2020
    The 4 Port Aux Fuel rail is fantastic. I have had it for almost 2 years now and everything has held up very nicely. The instructions in the kit are step by step great! The kit is a very complete kit that has absolutely everything you would need to run it.