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2007-2010 Tundra 4.0L V6 E85 Flex Fuel Conversion Kits

Boost Your Horsepower by up to 12% with Ethanol

In 2010 Toyota released a naturally aspirated 4.0L V6 engine capable of 236 horsepower. Though it was a reliable truck the lower horsepower made it not as desired as its V8 siblings. That being said, it was and is a more affordable option for someone looking for a great truck. And don’t let the perceived lower horsepower stop you from snatching up one of these if you are lucky enough to find one. Our E85 conversion kits can boost the HP in your 2010 4.0L V6 Tundra by up to 12%.

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 so easy to install that you can do it yourself in an afternoon. They also provide numerous benefits for you and your 2010 4.0L V6 Tundra. Increase your horsepower by up to 12%, set driving profiles from your phone to manage performance and fuel economy, and eFlexPro comes with eFlexTuning software, allowing you to tune your Tundra on a fuel mixture of E50 or higher.


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 Tundra
Engine4.0l / 1GR-FE
Power236 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

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