FLEXFUEL

MorePower. More Flexibility. Cleaner Driving.

Unlock your engine’s full potential with the bootmod3 FlexFuel Kit. Drive on E85, pump gas, or any blend — max performance, no compromises.

bootmod3 is like unlocking your car’s hidden superpower.

The world's most advanced BMW tuning platform. Real-time engine management that adapts to your driving style and modifications.

FlexFuel means your car becomes fuel-smart.

bootmod3 FlexFuel kit makes getting the required Flex Fuel hardware on your car with incredible ease and minimal effort, in your own driveway.

No hacks. No guesswork. Just pure performance.

self-adapting, high-performance

Why Choose FlexFuel?

You control what goes into your tank — and what comes out of your engine.

More Power

E85's higher octane rating allows for more aggressive timing and boost, unlocking hidden horsepower.

Detonation Resistance

Superior knock resistance means safer tuning at higher power levels without engine damage.

Fuel Flexibility

Run E85, pump gas, or any blend. Switch between fuels without any manual adjustments.

Cost Savings

E85 is typically cheaper than premium gasoline, saving money on every fill-up.

Daily + Track Ready

Perfect for street driving and track days. Instant adaptation to any fuel mixture.

Lower Emissions

E85 burns cleaner than gasoline, reducing your carbon footprint while increasing performance.

Get Started in Minutes

How It Works

Whether you’re running pump gas or full E85, bootmod3’s FlexFuel Plug & Play Kit adapts your tune in real time. Ethanol content is automatically detected and applied, delivering optimized power, fuel trims, and ignition timing—with zero manual map switching.

Step 1

Fill Your Tank

Any blend of gas and E85

Step 2

Sensor Detects

Real-time ethanol content analysis

Step 3

ECU Adapts

Instant performance optimization

Step 4

You Drive

Maximum performance, zero worry

High Flow

Our kit is entirely plug and play with the factory vehicle harness. No cutting, splicing of OEM wiring/connectors. It installs in minutes and can be removed without a trace on the car!

Standard flow sensor
Plug-and-play installation

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Basic

Our kit is entirely plug and play with the factory vehicle harness. No cutting, splicing of OEM wiring/connectors. It installs in minutes and can be removed without a trace on the car!

High-flow sensor
Race-grade components

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Find out more about REV2

Looking to unlock the full power of FlexFuel and real-time tuning? Pair your REV2 Controller with the FlexFuel High Flow Kit and get both at a reduced combo price—saving you $200.

Get the Bundle & Save

Fully Plug and Play

No Lifts. No Splicing. No Headaches.

No cutting or modifying factory fuel lines

100% Plug & Play to OEM harnesses (EKP3 or BDC/FEM)

Fully removable & reversible with no trace

Works seamlessly with factory fuel hat location

One Kit. Infinite Fueling Freedom.

Go full FlexFuel today and unleash the power of ethanol without compromise.

Order the Kit

Performance Essentials

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Software licences

Includes OTS Maps, Updates, and Cloud Sync

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Hardware parts

Everything You Need to Connect and Flash

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bootmod3 App

Mobile and Desktop App for Tuning, Datalogging & Diagnostics

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Merch

Official bootmod3 Apparel and Accessories

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Not sure?

Frequently Asked Questions

Find answers to the most commonly asked questions about bootmod3, from installation to troubleshooting and beyond.

Will this damage my engine?

No — not when properly tuned. E85 actually runs cooler and is more knock-resistant than pump gas, which means safer performance under boost. With the right setup (injectors, tuning, fuel system), it's one of the best fuels for turbo engines. And with bootmod3's FlexFuel integration, the system always keeps the motor in the safe zone.

Can I run a mix of E85 and gas?

Yes! That's the main advantage of the FlexFuel system. bootmod3 automatically detects and adapts to any mixture of E85 and gas in your tank. You can fill up with any combination—from pure gas to E85—and the system will automatically adjust the tuning for optimal performance.

Do I need a remap to run FlexFuel?

Yes, you'll need a bootmod3 FlexFuel map that supports variable fuel mixtures. This map automatically adjusts fuel injection, timing, and other parameters based on the detected E85 mixture in your tank.

Is installation difficult?

Not at all! Our FlexFuel kit is designed for easy installation. Most users can install the system in their own garage space. It includes detailed instructions, and support is available if you need help.

What kind of performance gains can I expect?

Performance varies depending on your vehicle and setup, but most users see significant improvements in power and torque, especially with higher percentages of E85. E85 provides better cooling and higher knock resistance, which allows for more aggressive tuning settings.

Can I switch back to pump gas?

Absolutely! One of the best things about the FlexFuel system is that you can switch back to pure gas whenever you want. The system automatically detects the change and adapts. No need for additional adjustments or reflashing.