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

Run E85 Flex Fuel in Your 2014-2021 Subaru WRX STI with eFlexFuel Kits

Subaru WRX STI E85 ethanol conversion kit

Can You Run E85 Flex Fuel in Your 2014-2021 Subaru WRX STI? With an eFlexFuel Kit Installed You Can, and Here’s Why It’s a Good Idea.

If you're a proud owner of a 2014-2021 Subaru WRX STI, you're likely always on the lookout for ways to enhance your car's performance. One effective upgrade is installing an eFlexFuel kit to run E85 flex fuel. But why should you consider this for your Subaru WRX STI? Let's dive into the reasons.

Boost Your EJ257 Engine's Performance

The heart of your Subaru WRX STI is the EJ257 engine, a 2.5 liter 4 cyl DOHC turbocharged marvel. This engine is already known for its robust performance, but with an eFlexFuel kit, you can take it to the next level. Running on E85 allows your engine to produce more horsepower compared to regular gasoline. This is because E85 has a higher-octane rating, which means your engine can handle higher compression and more aggressive tuning.

Save Money with E85

One of the significant benefits of flex fuel is the potential cost savings. E85 fuel is often cheaper than regular gasoline. With the right eFlexFuel system, your Subaru can run efficiently on this cost-effective fuel. Plus, E85 burns cleaner, which can lead to less wear and tear on your engine over time.

Flex Fuel Vehicles and Flex Fuel Kits

Flex fuel vehicles, like your Subaru WRX STI with an eFlexFuel kit, can run on a mixture of ethanol and gasoline. This flexibility means you can switch between E85 and regular gasoline depending on availability and price. Installing an eFlexFuel kit transforms your car into a versatile machine that can take advantage of both types of fuel.

Finding E85 Fuel Locations

Worried about finding E85 flex fuel stations? There are more E85 fuel locations than you might think. A quick search online or using dedicated apps can help you find nearby stations. This accessibility makes it easier to keep your tank filled with this high-performance fuel.

Flex Fuel vs Gasoline

When comparing flex fuel vs gasoline, the performance and environmental benefits of flex fuel stand out. E85 contains ethanol, which burns cleaner than gasoline, reducing your carbon footprint. Moreover, the higher octane rating of E85 allows for more aggressive tuning, translating to better performance on the road.

Can you use regular gas in a flex fuel vehicle? Yes, with an eFlexFuel kit installed, your Subaru WRX STI can run on both E85 and regular gasoline.

Is E85 the same as flex fuel? Not exactly. E85 is a type of flex fuel, consisting of 85% ethanol and 15% gasoline.

Addressing Concerns

Some drivers worry about potential E85 flex-fuel problems. However, with proper installation, these issues are rare. eFlexFuel systems are designed to handle the demands of E85, providing a reliable and efficient solution.


Upgrading your 2014-2021 Subaru WRX STI with an eFlexFuel kit is a smart move for any enthusiast looking to enhance performance and save money. With the ability to run on both E85 and regular gasoline, your Subaru becomes a more versatile and powerful machine. Embrace the benefits of ethanol fuel and experience the difference with eFlexFuel systems.

Whether you're chasing higher horsepower, cleaner emissions, or cost savings, an eFlexFuel kit is a worthy investment for your Subaru WRX STI. So, why wait? Unlock your car's full potential today.

Verify Your Vehicle’s Fitment Here


June 28, 2024

Want $50 off your eFlex kit?

Easy! Sign up for the latest E85 and eFlexFuel News, Giveaways and Specials, and we’ll hook you up with a $50 discount code.

By providing your phone number, you agree to receive promotional and marketing messages, notifications, and customer tservice communications from eFlexFuel. Message and data rates may apply. Consent is not a condition of purchase. Message frequency varies. Text HELP for help. Text STOP to cancel. See terms.