If you are looking to unlock the full potential of your vehicle with E85 fuel, you have come to the right place. E85 offers higher octane and cooler intake temperatures, which can translate into more power and efficiency when set up correctly.
This guide reviews the best E85 conversion kits on the market, from complete flex fuel systems to essential fuel line upgrades and additives. Whether you are a weekend racer or a daily driver, you will find the right components to make the switch safely and effectively.
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E85 Flex Fuel Conversion Kit For ATS/CTS
Best forATS and CTS flex fuel monitoring
- Real-time ethanol percentage monitoring
- Runs any E85 or gasoline mix
ConsiderRequires separate PCM tune
Quick Fuel 34-45E85QFTE-85 Conversion Kit For M4500 HP
Best forHigh-performance carbureted race engines
- Billet 3-circuit metering blocks
- E85-specific boosters and floats
ConsiderRequires M4500 HP carburetor
Conversion Kits for E85 E86 Z4 2.5i 3.0i 3.0si M3.2 2002-2008 Headlight Bal…
Best forBMW Z4 headlight ballast replacement
- Direct replacement design
- Stable power supply for headlights
ConsiderOnly fits E85/E86 Z4 models
for E65 E66 E67 E68 E85 E86 008 290 2002-2008 D2R Conversion Kits D2S 5DV
Best forBMW D2R/D2S lighting upgrade
- Flame-retardant and shock-resistant
- Improves lighting brightness and range
ConsiderGeneric brand may lack OEM fit
EVIL ENERGY 6AN 3/8" PTFE LS Swap EFI Fuel Line Fitting Kit, E85 Nylon Brai…
Best forLS swap fuel line upgrades
- High working pressure rating
- Compatible with all fuels
ConsiderMay require additional fittings for some setups
AOOSEDOO 8AN PTFE Fuel Line Kit, AN8 E85 Nylon Braided PTFE Fuel Line Hose …
Best forComplete 8AN fuel system installation
- Includes all fittings and adapters
- Comes with installation tools
Consider8AN may be overkill for stock setups
Piodelo 6AN 3/8" PTFE LS Swap EFI Fuel Line Fitting Kit, 25FT PTFE Fuel lin…
Best forCorrosion-resistant EFI fuel lines
- High corrosion resistance
- High pressure rating
ConsiderMay require careful measurement for fit
REV X E85 Ethanol Resusable Tester + E-Boost E85 Fuel Additive Kit
Best forE85 fuel testing and additive protection
- Reusable ethanol tester
- Additive prevents corrosion
ConsiderAdditive needs periodic reapplication
Control 63126907488 63120150614 D2S for 5 7 Series E60 E65 E53 E85
Best forBMW headlight ballast replacement
- Plug-and-play installation
- Low power consumption
ConsiderGeneric brand may have fitment issues
Bevinsee 75mm Wheel Stud Conversion Kit
Best forTrack wheel swaps and durability
- Heat-treated CrMo steel
- Quick wheel changes with standard nuts
ConsiderNot compatible with E65 or E83
ZZPerformance E85 Flex Fuel Kit for ATS/CTS – Smart Ethanol Monitoring
Brand: ZZPerformance
A smart, flexible conversion kit for ATS and CTS owners with a compatible tune.
The ZZPerformance E85 Flex Fuel Conversion Kit is a smart choice for ATS and CTS owners who want to run any mix of E85 or premium gasoline without reprogramming. It monitors the ethanol percentage in real time, allowing your engine to adjust fuel delivery automatically. This kit is perfect for those who want flexibility at the pump, especially when E85 availability is inconsistent.
Keep in mind that this kit requires a ZZPerformance PCM tune to function correctly. If you already have or are willing to get that tune, this kit integrates seamlessly and provides peace of mind. The monitoring capability is a standout feature, ensuring you always know what is in your tank and how it affects performance.
- Real-time ethanol percentage monitoring
- Runs any E85 or gasoline mix
- Seamless integration with ZZPerformance tune
- Requires separate PCM tune
- Limited to ATS and CTS models
Quick Fuel E85 Conversion Kit for M4500 HP – High-Performance Carburetor Upgrade
Brand: Quick Fuel Technology
A comprehensive upgrade for M4500 HP carburetors, ideal for race applications.
The Quick Fuel Technology E85 Conversion Kit is designed for racers and high-performance enthusiasts running the M4500 HP carburetor. It includes billet 3-circuit metering blocks with 4-stage emulsion and adjustable restrictions, giving you precise fuel control. The HP style boosters with CNC aluminum annular inserts are modified for E85 and anodized, ensuring durability and consistent atomization.
This kit also comes with replacement Nitrophyl floats, stainless steel squirter screws, and .130″ stainless steel needles and seats. The GFLT 50cc diaphragms provide reliable fuel delivery under high demand. If you are serious about maximizing your carbureted engine’s performance on E85, this kit delivers the necessary components for a robust setup.
- Billet 3-circuit metering blocks
- E85-specific boosters and floats
- Includes stainless steel hardware
- Requires M4500 HP carburetor
- Professional installation recommended
E85 E86 Z4 Headlight Ballast Conversion Kit – Reliable Lighting Upgrade
Brand: Generic
A simple, reliable ballast replacement for Z4 owners needing consistent lighting.
This conversion kit is specifically designed for BMW E85 and E86 Z4 models (2002-2008) to replace the headlight ballast. It provides a stable power supply to your headlights, ensuring bright and consistent illumination for safer night driving. The direct replacement design means you can install it in the original location without complex wiring or modifications.
The durable casing resists high temperatures, vibrations, and moisture, making it a reliable long-term solution. If your current ballast is failing or you want a dependable backup, this kit offers a straightforward fix. It is a practical upgrade for maintaining optimal visibility on the road.
- Direct replacement design
- Stable power supply for headlights
- Durable casing resists heat and moisture
- Only fits E85/E86 Z4 models
- No additional features beyond ballast
D2R/D2S Conversion Kit for E65 E66 E85 – Enhanced Lighting Control
Brand: Generic
A reliable control module upgrade for better headlight performance on compatible BMWs.
This conversion kit is designed for BMW models including E65, E66, E67, E68, E85, and E86, covering D2R and D2S headlight systems. It features high-quality flame-retardant materials with excellent heat dissipation and shock resistance, ensuring stable operation. The control module converts voltage and stabilizes current, which helps your headlights function properly in various road conditions.
You will notice improved lighting brightness with rapid start-up and low power consumption, increasing your visibility range. Installation is straightforward, requiring no complicated tools. This kit is a great way to enhance your headlight performance without upgrading the entire assembly.
- Flame-retardant and shock-resistant
- Improves lighting brightness and range
- Easy plug-and-play installation
- Generic brand may lack OEM fit
- Limited to specific BMW models
EVIL ENERGY 6AN PTFE Fuel Line Kit – Durable E85 Fuel Delivery
Brand: EVIL ENERGY
A sturdy PTFE fuel line kit ideal for LS swaps and E85 conversions.
The EVIL ENERGY 6AN PTFE fuel line kit is perfect for EFI LS swaps and conversions, offering a robust solution for E85 fuel delivery. The PTFE nylon braided hose handles a wide temperature range from -76°F to 446°F and a maximum working pressure of 1,500 PSI. This makes it suitable for high-performance applications where fuel pressure and temperature can vary.
The kit includes all necessary components shown in the picture, ensuring you have what you need for installation. It is compatible with all automotive fuels, lubricants, and coolants, so you can use it with confidence. If you are building an LS swap or upgrading your fuel system, this kit provides a durable and versatile option.
- High working pressure rating
- Compatible with all fuels
- Includes all necessary fittings
- May require additional fittings for some setups
- Nylon braid can be stiff to route
AOOSEDOO 8AN PTFE Fuel Line Kit – Complete Installation Package
Brand: AOOSEDOO
A complete, tool-inclusive PTFE fuel line kit for serious fuel system builds.
The AOOSEDOO 8AN PTFE fuel line kit is a comprehensive package that includes 20 feet of nylon braided PTFE hose and all necessary fittings and adapters, including straight, 45, 90, and 180-degree options. This saves you time and hassle during installation, as everything you need is in the box. The kit also comes with an AN fitting wrench and soft vise jaws to prevent scratches, plus a reaming tool for hose prep.
The 8AN fittings are made from high-quality aluminum, ensuring durability and resistance to wear. This kit is versatile, handling automotive fuels like gasoline and E85 with ease. If you want a complete solution for your fuel system, this kit simplifies the process and delivers reliable performance.
- Includes all fittings and adapters
- Comes with installation tools
- Durable aluminum fittings
- 8AN may be overkill for stock setups
- Hose length may be excessive for some projects
Piodelo 6AN PTFE Fuel Line Kit – Corrosion-Resistant EFI Upgrade
Brand: Piodelo
A high-quality PTFE fuel line kit with excellent corrosion resistance and pressure handling.
The Piodelo 6AN PTFE fuel line kit is crafted from T7 aluminum alloy and nylon with a PTFE lining, offering excellent corrosion resistance. The polished and anodized surface not only looks great but also provides protection against the elements. With an inner diameter of 5/16 inch and an outer diameter of 0.465 inch, it is sized for EFI systems and LS swaps.
This kit withstands operating temperatures from -76°F to 446°F and a maximum working pressure of 3,000 PSI, with a burst pressure of 10,000 PSI. It is compatible with all automotive fuels, lubricants, and coolants, making it a versatile choice. If you need a reliable fuel line for your EFI conversion, this kit delivers performance and durability.
- High corrosion resistance
- High pressure rating
- Polished anodized finish
- May require careful measurement for fit
- Includes only 15 fittings, not all angles
REV X E85 Tester and E-Boost Additive Kit – Fuel Protection and Performance
Brand: REV X
A valuable kit for E85 users to protect their engine and verify fuel quality.
The REV X E85 kit combines a reusable ethanol tester with the E-Boost fuel additive, designed specifically for E85, methanol, and other alcohol-based fuels. The E-Boost eliminates harmful corrosive elements typically present in alcohol fuels, extending the life of your engine and fuel system. It also enhances performance and engine response, potentially lowering your elapsed times on the track.
Additionally, E-Boost improves lubrication for the upper cylinder and fuel system components, reducing wear. The included tester allows you to verify the ethanol content in your fuel, ensuring you are getting what you pay for. This kit is a practical addition for anyone running E85 regularly, offering both protection and performance benefits.
- Reusable ethanol tester
- Additive prevents corrosion
- Improves engine response and lubrication
- Additive needs periodic reapplication
- Tester may not be as precise as lab equipment
Headlight Control Module for BMW E60 E65 E85 – Plug-and-Play Replacement
Brand: Generic
A simple, reliable replacement module for compatible BMW models.
This control module is designed for BMW models including E60, E65, E53, and E85, offering a direct replacement for the headlight ballast. It features high-quality materials and workmanship, ensuring stable performance and easy installation. The plug-and-play design means you can install it without complicated operations, saving time and effort.
The module operates with low power consumption, so it won’t burden your vehicle’s electrical circuit. It is built to meet various daily driving scenarios, providing reliable headlight function. If you need a dependable replacement for a failing ballast, this is a straightforward solution.
- Plug-and-play installation
- Low power consumption
- Stable performance for daily driving
- Generic brand may have fitment issues
- No advanced features
Bevinsee 75mm Wheel Stud Conversion Kit – Track-Ready Wheel Security
Brand: Bevinsee
A sturdy wheel stud conversion for track enthusiasts seeking convenience and strength.
The Bevinsee 75mm Wheel Stud Conversion Kit is machined from 4135 CrMo steel and heat-treated for strength and durability. It uses M12x1.5 threads, fitting most E-series chassis vehicles, though it is not suitable for E65 or E83. The 75mm length accommodates washers up to 12mm thick, ensuring full engagement without protruding beyond most closed nuts.
This kit is perfect for track days, allowing you to swap wheels quickly using standard nuts instead of struggling with factory wheel bolts. The robust construction ensures reliability under demanding conditions. If you track your car or simply want easier wheel changes, this conversion kit is a worthwhile upgrade.
- Heat-treated CrMo steel
- Quick wheel changes with standard nuts
- Accommodates thick washers
- Not compatible with E65 or E83
- Requires removal of factory bolts
Buyer’s Guide: What to Consider
Choosing the right E85 conversion kit depends on your vehicle, goals, and budget. This guide highlights key factors to consider, from compatibility and fuel system materials to tuning needs and installation complexity. Use these points to make an informed decision that suits your specific situation.
- Compatibility: Ensure the kit is designed for your specific vehicle make and model. Some kits are model-specific, like the ZZPerformance for ATS/CTS, while others are universal. Check fitment notes to avoid compatibility issues.
- Fuel System Components: E85 is corrosive and can damage standard fuel lines. Look for PTFE-lined hoses and stainless steel fittings. Kits like the EVIL ENERGY and AOOSEDOO provide durable fuel lines that resist ethanol's corrosive effects.
- Tuning Requirements: Some conversion kits require a custom tune to adjust fuel delivery for E85. The ZZPerformance kit explicitly requires their PCM tune. Factor in tuning costs and availability when choosing a kit.
- Performance Goals: Consider what you want to achieve. For racing, a carburetor kit like Quick Fuel is ideal. For daily driving, a flex fuel sensor kit offers convenience. Choose a kit that matches your performance and usage needs.
- Installation Complexity: Assess your mechanical skills. Some kits are plug-and-play, like headlight ballasts, while others require professional installation. PTFE fuel line kits may need special tools, though some include them. Choose a kit that fits your comfort level.
Conclusion
E85 conversion kits come in many forms, from complete flex fuel systems to essential fuel line upgrades and additives. The best choice depends on your vehicle and how you plan to use E85. For ATS/CTS owners, the ZZPerformance kit offers smart monitoring, while racers will appreciate the Quick Fuel carburetor kit. Fuel line kits from EVIL ENERGY and AOOSEDOO provide durable solutions for any build.
Remember to consider compatibility, tuning requirements, and installation complexity before purchasing. Whether you are upgrading for performance or reliability, there is a kit on this list to meet your needs. Choose wisely and enjoy the benefits of E85.
Erica Steven is the founder and lead writer of WorstBrands, a site dedicated to providing honest and trustworthy reviews about outdoor gear and fashion products.
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