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

2005-2012 C6 Corvette LS7 E85 Fuel System

Increase the HP of 427 Engine by 12% with Our Flex-Fuel Conversion Kit

The powerful LS7 engine by GM was engineered for performance. With 505 horsepower, this 427 cubic inch engine certainly delivers, making its way into legendary vehicles like the 2005-2012 Corvette and the fifth-generation Camaro Z/28. Our E85 conversion kits will increase the overall horsepower of your LS7 engine by up to 12%. eFlexPro gives you the added ability to tune your muscle car for efficiency or power and everything in between.

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


With easy DIY installation instructions, the eFlexFuel Plus or the eFlexFuel Pro will have you running your C6 Corvette LS7 on any mixture of E85 fuel and gasoline that you see fit. These plug n’ play modules not only convert your car to be flex-fuel compatible but provide software for you to tune your car. It’s important to note that you need fuel blends higher than E50 to tune your car with eFlexPro. Our APP allows you to monitor your E85 mixture and switch between the eco and performance profiles, depending on your needs.


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 & ModelChevrolet Corvette
Engine7.0l / LS7
Power505 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!