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2012-2013 Ford Mustang Boss 302 5.0 E85 Kit

Increase your HP by up to 12% with our Plug n’ Play Flex Fuel Conversion Kit

The 2012-2013 Mustang Boss 302 produces 444 horsepower on a stock, naturally aspirated engine. This makes for an incredibly efficient muscle car. Aside from the horsepower, the Boss has several other tweaks from engine tuning, suspension upgrades, braking, and the rear end to round out the stock package. You can still increase the horsepower of your Boss 302 by up to 12% with our E85 conversion kit.

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 2012-2013 Mustang Boss 302 by up to 12%. It’s plug n’ play and you can use the eFlexPro to tune your 5.0 Coyote engine if 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 & ModelFord Mustang
Engine5.0l / U / Coyote
Power444 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.

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Warning signNot legal for sale or use on pollution-controlled vehicles

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