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2011-2018 Grand Cherokee SRT8 6.4L HEMI E85 Kit

Increase Your HP By Up To 12% with Our Plug n’ Play Flex Fuel Conversion Kit

The 2011-2018 Grand Cherokee SRT8 produces a respectable 470 horsepower with its 6.4L HEMI. That extra HP and torque can come real handy in off-road applications when climbing steep inclines and running jeep obstacle courses but it won’t have any trouble keeping up on the road, either. Converting your Grand Cherokee to E85 will help boost your HP by up to 12% but you will also see savings at the pump which is always welcome in an SUV.

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 easy DIY flex-fuel conversion kits, eFlexPlus, and eFlexPro can increase the horsepower of your 2011-2018 Grand Cherokee SRT8 by up to 12%. It’s plug n’ play and you can use the eFlexPro to tune your 6.4L HEMI engine as long as you have a fuel mixture greater than E50.


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 & ModelJeep Grand Cherokee
Engine6.4l / ESG / Hemi V8
Power475 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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