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

2011-2013 Tundra 4.0L V6 E85 Flex Fuel Conversion Kits

Boost Your Horsepower by up to 12% with Ethanol

In 2011, Toyota upgraded their Tundra 4.0 V6 engine to maintain its displacement while increasing horsepower. This made the truck more desirable pushing 270 HP without greatly affecting the overall gas mileage. Now being more efficient and more powerful this iteration of the Tundra lasted through the model year 2013. Being the last generation of 6-cylinder Toyota Tundras these are still very sought-after full-size trucks. If you manage to snag one of these and want to boost your horsepower while increasing efficiency, eFlexFuel has you covered with our 2011-2013 Tundra E85 flex fuel conversion kit engineered for this 4.0L V6 marvel.

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 they can be done in an afternoon and provide numerous benefits for you and your 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 2011-2014 Tundra V6 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
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!