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What is a flex fuel system?
A flex fuel system allows a vehicle to run E85, gas, or any blend of ethanol and gas seamlessly without any user input required. The patented ProFlex Commander performance flex fuel system does this in real-time with no latency while maximizing power gains no matter the fuel blend.
Are your systems really plug and play?

Most of them are, yes. All ProFlex™ Commander systems are complete plug and play systems that can be installed by you or your shop in about an hour with few exceptions. No other parts or tuning is required. Period. Plug it in, close your hood, add E85. We like to say the Commander is a “third grader level” installation job because it is that easy.

Our FlexLink™ systems have a variety of uses and some require very minor tuning, specifically in GM models with ECU flex mapping. The tuner will pin your ECU and turn on your flex fuel maps, which are turned off from the factory. This is generally about a 1-2 hour job for a tuning shop. If you have your own tuning system like HPTuners MPVI2 you can do it all yourself.

All of our fuel hoses, wiring harnesses and electronic components are OE quality, model specific and fully assembled with no cheesy hose clamps or frustrating bits and pieces to mess with.

Please note: You should be wary of products that use metal air lines for fuel, fuel lines with hose clamps or harnesses with DIY connectors or bare wire connectors. Fuel leaks and electrical continuity issues can result in engine and underhood area damage.

Can I still run gas?
Yes, we only make true adaptive flex fuel solutions which means you can still run gas, or E85 or any mix and you can switch fuels anytime without doing anything but opening your gas door and pumping whichever fuel you want. It’s that simple, nothing up our sleeve, nothing behind the curtain.
Why should I run E85?
E85, a blend of ethanol and gasoline, has several advantages over gas. E85 makes more horsepower than gasoline in all applications. E85 also cools engine and oil operating temperatures, cleans your engine internals, reduces emissions and prevents knock. All these things add up to more power, a longer lasting engine and a cleaner tailpipe.
What if I have a tune or plan to get one?
The ProFlex™ Commander is 100% compatible with all stock and performance gas tunes and will automatically adjust when changing the tune, so you can run the tune you have now or make changes whenever you want.
Will I make more Horsepower with your system and E85?
Yes. Ethanol fuel has a faster burn rate, a faster expansion rate and a faster flame front than gasoline. Horsepower is created by expanding gas pushing your pistons down in the cylinder. Pushing the piston harder and faster makes more power. Because of this, E85 does not require special tuning or timing to increase power. We have dyno tested hundreds of different vehicles on gas vs. E85 in our very carefully controlled test environment. Every single engine made more power regardless of make, model, engine type or tune. In naturally aspirated applications we generally see 7-8% more wheel HP. With forced induction it is normally 10-11% more wheel HP. Similar torque gains are observed.
Will I need to upgrade my fuel system?
Generally speaking, no. We dyno test every car, truck or SUV that we offer a kit for to measure power gains and to make sure the injectors and fuel pump have enough capacity for full E85. If you have power adders you may need to make some fuel system upgrades to handle the larger volumes required at the injector to burn full E85. Give us a call or email us at with some info about your upgrades or project goals and we can help you make sure you are covered for E85 or suggest necessary steps to get there.
Will E85 ruin my fuel system?
No!!! This is a common myth. Any vehicle built after 1996, no matter the brand, has a fuel system that is fully compatible with ethanol. With the introduction of E10 all manufacturers removed the natural rubber from their OE fuel systems, which is the only thing ethanol does not get along with. Ethanol is pure corn alcohol and will not damage anything in your fuel system or cause any residual build-up. In fact, E85 acts as a powerful cleaner to keep your engine and injectors cleaner and cooler than when you run gasoline. All other things being equal you can expect significantly longer engine life if you run E85 regularly.
Do I have to run gas periodically?
We get this question a lot and the answer is, no. With an AFD™ flex fuel system you are welcome to run gas anytime you want to, but it is also just fine to run E85 every day, all the time for the life of the vehicle. E85 is clean, burns cooler than gas and when managed properly with an Advanced Fuel Dynamics flex fuel system is 100% safe for your engine.
Is nitrous compatible with your ProFlex system?

Yes, you can run nitrous oxide (NOx) with ProFlex™ however there is no such thing as “flex nitrous”. The nitrous system is jetted for a particular fuel, usually gasoline. If you want to run nitrous with E85 you will need to have your system specifically jetted for E85 and you will only be able to hit the bottle when running E85. Our ProFlex Connect™ smartphone app shows you exactly how much ethanol you have in your car, so you can use the app to make sure you have the right fuel blend for your nitrous system in real time.

Make sure to talk to your nitrous system supplier about the right jetting for the fuel you plan to use while boosting on nitrous.

How do I tune my car with a ProFlex Commander installed?

This is our most frequently asked question and the answer is really simple. You don’t have to change a thing. You can run your stock tune or any performance gas tune with the Commander. When you visit your tuning shop put gas in the tank and have them install their best 91/93 tune the same way they always do. The ProFlex™ system was specifically designed to stay out of your tuner’s way so they can do what they always do without making accommodations for our system.

Ethanol fuels have a very high octane equivalent to gas and are very stable. However, E85 is a completely different fuel from gasoline and does not depend on timing for making power. We have tested many tunes and timing settings on the dyno and what we have found is that a good gas tune makes the most power when you are running gas and when you run E85. Running a good pump gas tune with the Commander means your car will still be “flexible”, that is, you will still be able to fill up with either fuel and have safe, high horsepower performance.

Please note: If your tuner is unfamiliar with our products they are always welcome to call us or reach out to with questions so we can help them understand how to tune around our system. Once tuners understand our technology they often become big supporters and even installing dealers so don’t hesitate to have them contact us. We are always happy to help and we speak their language.

Why is The ProFlex system the best way to run E85?

First of all, all E85 is not equal. When you go to the pump your E85 is going to be somewhere between 51% and 83% ethanol. That’s the federal standard. To run E85 safely and get the most power the fuel volume at the injector (fuel load) needs to be precisely indexed to the ethanol percentage. If it is not, you can either run dangerously lean and burn a piston or you can run rich and wash your cylinder walls which will cause piston ring failure and cylinder wall scoring. Not good.

An “E85 tune” is a dinosaur in the industry. An E85 tune is good for one thing; 85% ethanol, which as we’ve explained, you will never get at the pump. Essentially, an E85 tune is only for cars that run barrel grade race fuel that is guaranteed to be exactly 85% ethanol. If you want to go to the pump for your E85, or run gas sometimes an E85 tune is a terrible idea and will definitely (DEFINITELY!) damage your engine. Our patented ProFlex technology was developed specifically to solve the problem of the engine damage and reduced life expectancy caused by E85 tunes.

There are also “wide band” systems that work off of your oxygen sensor data to try to correct the rich/lean condition caused by differences in fuel content. The time it takes to adjust to changes in fuel content is called latency. For comparison, a wide band or “flex tune” can have latency for as much as hundreds of miles. The Commander works in real time and has zero latency. In short, wide band systems are painfully slow, nearly always incorrect and will definitely cause your engine to fail prematurely. Again, we are not saying wide band doesn’t work, but it is a terribly slow and inaccurate way to handle flex fuel and with the ProFlex Commander available there is no reason to settle for something that works half as well and generally costs more.

WARNING: If you ever see a system that requires you to measure your fuel content or watch your injector duty cycle, run the other way. There is no reason you should have to work to run E85. Mathematically derived duty cycle is a mythical beast using fuzzy math. It is a smoke and mirrors way to convince you to buy an inferior management system.

Your engine performance and life expectancy depend on you making good decisions when you choose a flex fuel solution. A new engine is a lot more expensive and painful than getting the right solution now. AFD customers have never reported any engine damage from using our system in our entire history and we are not going to start with yours!

The ProFlex™ Commander is the most sophisticated and accurate way to run E85 and it is patented. We developed the Commander to do all of the heavy lifting for you.

The key to injector performance is the most complete atomization of the fuel possible while delivering precisely measured fuel volume. Our patented Digital Injector Management™ (DIM™) is incredibly fast and accurate, meaning we can control your injectors much more precisely than your ECU/PCM, which uses slower analogue duty cycle signals. DIM delivers fuel loads more accurately than any other system, with the ability to digitally manipulate both injector pulse duration and speed allowing for better atomization and improving performance. This is why the Commander typically increases horsepower even when the vehicle is running on gasoline. In fact, by eliminating the obsolete analogue duty cycle control from the equation, the Commander can actually deliver more fuel at any given load than any other injector management system including your factory ECU allowing your injectors to supply E85 exactly as needed. Even without E85 the Commander is a vast improvement over your factory computer in terms of injector control and fuel management.

Our BlendSense™ technology measures content in real time with a 30 microsecond refresh rate and zero latency, meaning the system is always 100% correct no matter what fuel you are running and is seamlessly compatible with gas tunes and power adders.

Simply put, the Commander does exactly what it is supposed to do in real time with no monitoring, flashing, upgrading or measuring. It is the only flex fuel system like it in the world. There is simply no more accurate and reliable way to maximize power and engine safety than the ProFlex Commander. And the Commander is made in the USA.

What is the difference between the standard Commander and the PRO version?
Simply put, the Commander PRO has upgraded injector management algorithms for large injectors and forced induction. If you have larger than stock size injectors or forced induction, or plan to add them in the future, order the PRO. Otherwise, the standard system will work fine.
Will the PRO version work on my stock set-up?
Yes, the PRO works fine with stock or mildly upgraded cars, so you can run it now and go big power later. The Commander PRO will automatically adjust itself to any performance upgrades you make. No flashing, no settings, no messing around.
Do I need to upgrade my fuel system?

One of the things that makes our systems and our company different is our dyno lab testing. If you see a system on our site then that vehicle has been on our dyno. We carefully monitor air/fuel ratio, power gains and operating temperatures in a carefully controlled test environment. Because of this careful testing we can say for certain that a vehicle has a fuel system that can handle full E85 without upgrades.

If we find an engine that needs upgrades to run full E85 you will see that noted on the product page with injector recommendations. If not, you are good to go.

NOTE: If you have power adders you may need injectors, or in extreme cases, a fuel pump upgrade. We are very knowledgeable on fuel system upgrades and can help you figure out what you need for safe, effective E85 performance. Contact us directly if you have power adders or big power goals so we can help.

If I do need injectors can AFD help?
Yes. We are pros at calculating injector requirements for upgraded engines and can help you choose the right injectors for the job. We proudly offer FIC and Deatschwerks injectors which are the best tested and most reliable injectors for the money that we have found for our customers. Let us know if you need help with injectors by emailing or give us a call. We are always happy to help make sure you are getting the best, most appropriate set of injectors for your project goals.
How much power will I make on E85?
After performing hundreds, if not thousands, of dyno tests on a wide variety of cars, off road side-by-sides, trucks, SUVs and even motorcycles we have a great foundation for giving you realistic power gain expectations. When running 75%+ ethanol content you can expect to make 7-8% more wheel horsepower than you do on gas in a naturally aspirated environment. Forced induction applications consistently gain 10-11% more wheel horsepower over gasoline. These numbers are reliable and can be expected regardless of the gas tune.
Can I trust AFD with my flex fuel needs?
Absolutely! And we are not just saying that. Advanced Fuel Dynamics is not only a performance company. We help develop flex fuel technology for OEs, government entities and large fleet owners. When it comes to E85 and flex fuel technology we are the absolute experts and we make our expertise available to you with well tested products and an open door if you need help. We have been known to answer the phone in the middle of the night or travel thousands of miles to work on deep tech. We have never lost an engine or had a single customer report any engine damage from using our products. Not once. Not ever. We certainly are not going to start with yours.
Does the ProFlex Commander come with a warranty?
Yes, Advanced Fuel Dynamics Inc. warrants to the consumer that all ProFlex products will be free from defects in material and workmanship for a period of twelve (12) months from date of the original purchase. Products that fail within this 12-month warranty period will be repaired or replaced at AFD’s option, when determined by AFD that the product failed due to defects in material or workmanship. This warranty is limited to the repair or replacement of the AFD part. In no event shall this warranty exceed the original purchase price of the AFD part nor shall AFD be responsible for special, incidental or consequential damages or cost incurred due to the failure of this product. Warranty claims to AFD must be transportation prepaid and accompanied with dated proof of purchase. This warranty applies only to the original purchaser of product and is non-transferable. All implied warranties shall be limited in duration to the said 12-month warranty period. Improper use or installation, accident, abuse, unauthorized repairs or alterations voids this warranty. AFD disclaims any liability for consequential damages due to breach of any written or implied warranty on all products manufactured by AFD. Warranty returns will only be accepted by AFD when accompanied by a valid Return Merchandise Authorization (RMA) number. Product must be received by AFD within 30 days of the date the RMA is issued.
Return and Cancellation Policy
Advanced Fuel Dynamics accepts returns within 30 days of purchase on unopened, unused products only. We do not accept any returns of parts that have been installed. All returned components must be in the original sealed bags. All returns are subject to a 15% restocking fee plus a 3% processing fee. Shipping costs are non-refundable. If you need to return one of our products, please call 866.902.3835. You will be assigned a Return Merchandise Authorization (RMA) number. All returns must be accompanied by an RMA. Parts returned without an RMA number will not be processed and will be considered the property of Advanced Fuel Dynamics. Used and unbagged parts will not be refunded and can be returned to the customer on request at the cost of shipping. Return of any product is considered a tacit agreement to all terms of this return policy by the customer. Cancelation of unshipped orders will be refunded with a 6% cancellation fee to cover the cost of credit card processing associated with the transaction. All cancellations must be requested by email at Cancellation requests must include the order number and stated acceptance of the cancelation fee.