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2007-2010 Impreza WRX STi 2.5L E85 Flex Fuel Conversion Kits

Plug-and-Play. Easy to Install. Increases Horsepower by up to 20%.

This generation of the WRX STi was the end of an era in many ways for WRX fans. 2014 saw the end of the WRX STi Impreza. This also marked the end of the STi hatchbacks. It’s ok to be nostalgic whether you’re upgrading your 2007-2010 STi, modifying it, or just repairing it to keep it running. Not everyone wants a sedan. #AmIRight? Well, good news for the 3rd generation of the WRX STi is here! You can boost the horsepower of this mighty track machine by up to 20% with one of our E85 flex-fuel conversion kits.

No tuning required!

$749

Starting at $61.50 / month with Affirm logo

Truspilot consumer rating 4.7 SKU: U-EF-PLUS
  • Free shipping
  • Delivery time 2-5 days
  • 5 year warranty with registration

Introduction

The eFlexPlus and the eFlexPro are so easy to install that you can do it yourself in an afternoon and have your car running any mixture of E85 flex-fuel and standard gasoline the same day. Both come with a handy phone app that allows you to monitor the fuel mixture and switch between efficiency and performance profiles effortlessly. The eFlexPro comes with the additional eFlexTuner software that allows you to tune your turbocharged engine on any mixture of fuel above E50. Order one of these for your 2007-2010 Impreza

Installation

DIY level

Plug&Play installation with some modifications - An experienced mechanic will install in 2-3h. For first time DIY installation, expect to double the time needed.

Technical specs

Make & ModelSubaru Impreza
Years2007-2010
Engine2.5l / EJ257
Power296 hp
Fully Automatic Flex FuelAlways Optimized Fully Automatic Flex Fuel
Cooler & Cleaner EngineCooler & Cleaner Engine
No Tuning NeededComplete System, No Tuning Needed
Increase PerformanceUp to 10% Increase in Performance
Flex Fuel System VerifiedYour Fuel System Verified

DIY Virtual Load Sensor Tuning

Easily & safely create custom ethanol fuel maps based on your own vehicle's performance & modifications, without tapping into external load sensors - all from your laptop. Now you can augment your Ethanol fueling yourself, without touching your factory ECU and without jeopardizing engine safety.

Experience the VelvetTouch+

All eFlexFuel devices provide smoother and more seamless drivability than any other flex fuel system in existence. No small feat, our R&D team accomplished this with unrivaled attention to detail, countless long days & late nights, and a unique eye for optimization. The result of this "Velvet Touch" development? Our class-defining eFlexPro 2 & eFlexPlus.

Supercar Technology in your Daily Driver (or Weekend Warrior)

By installing the eFlexFuel kit, you're in good company. eFlexFuel conversion kits utilize technology found in the Koenigsegg Jesko, Dodge Challenger SRT Demon 170, and other top-tier performance vehicles. This tech is used to get the most out of E85, Gasoline, or whatever blend of the two you have in your tank.

Industry Leading, Free 5-Year Warranty (With product registration)

Nothing says, "We stand behind our product," like our free 5-Year warranty. We know what our kits are made of and we aren't afraid to put our money where our mouth is. You will not find a warranty like this anywhere else.

Expertly Engineered, Designed & Manufactured in Finland

Expertly Engineered, Designed & Manufactured in Finland. We have developed our hardware & software in-house in Pirkkala, Finland, since day one. Before shipping, we confirm every single control unit's functionality before shipping.

Technical Specs & Features

  • Precise Ethanol Content real-time measured over 100 times per second
  • Advanced signal processing filtering system in all input signals
  • Shock-Proof & Weather proof casing
  • High Quality Wiring Harness with snap in connectors (no soldering required)
  • Ethanol Tested & Approved fuel accessories (line, clamps, quick-connectors)
  • Bluetooth 5.2

eFlexApp Main Features

More eFlexApp Features

Please confirm device versions features at eFlexApp page

eFlexTuner Main Features

More eFlexTuner Features

Please confirm device versions features at eFlexTuner page

+ Compare products

Features
VelvetTouch+
Free 5-Year Warranty (with registration)
Ethanol Content real-time measured over 100 times per second
Advanced signal processing filtering system in all input signals
Shock-Proof & Weather Proof casing
High Quality Wiring Harness with snap in connectors (no soldering required)
Ethanol Tested & Approved fuel accessories (line, clamps, quick-connectors)
Bluetooth 5.2
Analog Wires for External Sensors
eFlexApp
Ethanol content
Engine RPM
Duty cycle
Fuel temperature
Ambient engine temperature
Injector activity
Cold enrichment
Device status
Driving mode selection
Cold enrichment custom setting (created with eFlexTuner)
Save RPM based enrichment with driving mode selection (created with eFlexTuner)13
eFlexPro view for analog data
eFlexTuner
RPM. based 2D fuel map
Fault codes
Data logging
Fuel map adjustment
Log file analysis
3D fuel maps
Sensor linkage
Cold start adjustment
Virtual Load Sensor Tuning

+ What's included

+ Installation

+ Returns

+ Warranty

Testimonial

Installation

What's included in the eFlexPro E85 flex fuel conversion kit

Customer Comments

Note: If your car is modified you can use E85 with eFlexFuel. If this is the case, please list all the main engine modifications on the checkout page. Our technical team will ensure that your setup is fit for E85.

* Power and torque increase depends on your engine technology and/or your custom built of the engine.

Prop 65 Warning
Warning signNot legal for sale or use on pollution-controlled vehicles
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