local_shipping Free shipping
credit_card Flexible payment options
verified_user 5 Year Warranty*
call 1-833-539-3835

2014-2021 Toyota 4Runner E85 Conversion Kit

Boost the Power of Your Off-Road Rig with Flex Fuel

In 2010, Toyota retired the 4-cylinder engine on their popular 4x4 SUV, the 4Runner. The 4.0 V6 has long been the more desired engine for this off-road rig. Its 270 horsepower provides more torque and thrust, allowing it to climb hills and traverse trails more effectively and efficiently. Looking to increase the horsepower of this SUV, many have turned to ethanol. With eFlexFuel’s E85 flex fuel conversion kits you can do it yourself over an afternoon.

No tuning required!

$699 List price $874

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


Our plug-and-play eFlexPlus and eFlexPro are easy to install and they can be done in an afternoon. They provide numerous benefits for you and your 4Runner including an Increase in horsepower by up to 12%, you can set driving profiles from your phone to manage performance and fuel economy, and eFlexPro comes with eFlexTuner software, allowing you to tune your SUV.


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 & ModelToyota 4Runner
Engine4.0l / 1GR-FE
Power270 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 20% Increase in Performance
Flex Fuel System VerifiedYour Fuel System Verified
Dynamically adjust engine tune to match fuel
Available performance and eco tunes
Select performance or eco tunes via eFlexApp
Create and save custom dyno tunes
Pro grade eFlexTuner tuning software

+ What's included

+ eFlexApp

+ eFlexTuner

+ Installation

+ Returns

+ Warranty

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

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

Want to Get $50 Off Your eFlex Kit?

Easy! Sign up to get the latest E85 Tech & News, eFlex product updates, vehicle spotlights, and more and we’ll hook you up with $50 OFF!