See only parts compatible with your vehicle

    Flex Fuel

    It's no secret that flex fuel is the greatest thing to hit the sport compact scene ever since covering your windows with oversized stickers was a cool thing to nobody ever. BUT, at least with flex fuel, you can safely boost our vehicle with ethanol without the crazy costs of black magic race gas. That's right, not only does corn make for tasty tortillas, but it makes that turbocharged vehicle of yours much faster. However, you can't just show up at your local ethanol station, fill it up and be on your way to glory. It takes a lot to pump out ethanol and your injector duty cycle needs to be strong enough to handle ethanol. 

    With that said, RallySport Direct carries flex fuel kits so that you can run ethanol successfully with the right injector, and the right fuel pump. We even carry sensors that measure the amount of ethanol is in your fuel so that you don't blow your motor up.

    Choose from a great selection of flex fuel kits from our friends at COBB Tuning, where there are staged kits available to meet your horsepower goals.

    While checking out flex fuel kits, check out our great selection of fuel injectors, fuel pumps, and fuel pressure regulators. 

    Shop featured products

    23 Results

    COBB Subaru NexGen Flex Fuel Ethanol Sensor Kit - 2015-2021 Subaru STI

    50 In Stock

    325650

    COBB Subaru NexGen Flex Fuel Ethanol Sensor Kit - 2015-2021 Subaru STI

    $790.00
    IAG PTFE Flex Fuel System Kit w/ 1300cc Injectors, Lines, FPR, Red Fuel Rails - 2008-2021 Subaru STI

    IAG-AFD-2322RD

    IAG PTFE Flex Fuel System Kit w/ 1300cc Injectors, Lines, FPR, Red Fuel Rails - 2008-2021 Subaru STI

    $2,625.61
    COBB CAN Flex Fuel Upgrade - 2018-2021 Subaru WRX

    29 In Stock

    344650

    COBB CAN Flex Fuel Upgrade - 2018-2021 Subaru WRX

    $1,035.00
    COBB Tuning Subaru Flex Fuel Pressure Sensor Kit - 2008-2021 Subaru STI

    54 In Stock

    315650

    COBB Tuning Subaru Flex Fuel Pressure Sensor Kit - 2008-2021 Subaru STI

    $275.00
    COBB CAN Gateway Vehicle Harness Upgrade Kit (For Upgrading Previous Cobb Ethanol Sensor Kit) - 2015-2017 Subaru WRX

    35 In Stock

    343650-UP

    COBB CAN Gateway Vehicle Harness Upgrade Kit (For Upgrading Previous Cobb Ethanol Sensor Kit) - 2015-2017 Subaru WRX

    $735.00
    IAG PTFE Flex Fuel System Kit w/ 1050cc Injectors, Lines, FPR, Black Fuel Rails - 2008-2021 Subaru STI

    IAG-AFD-2610BK

    IAG PTFE Flex Fuel System Kit w/ 1050cc Injectors, Lines, FPR, Black Fuel Rails - 2008-2021 Subaru STI

    $2,141.28
    COBB CAN Flex Fuel Upgrade - 2015-2017 Subaru WRX

    18 In Stock

    343650

    COBB CAN Flex Fuel Upgrade - 2015-2017 Subaru WRX

    $1,035.00
    Cobb Tuning CAN Flex Fuel Upgrade / Fuel Pressure Kit - 2015-2017 Subaru WRX

    SUB004WCAN1FFUP-FP

    Cobb Tuning CAN Flex Fuel Upgrade / Fuel Pressure Kit - 2015-2017 Subaru WRX

    $1,280.00
    IAG PTFE Flex Fuel System Kit w/ 1700cc Injectors, Lines, FPR, Black Fuel Rails - 2008-2021 Subaru STI

    IAG-AFD-2612BK

    IAG PTFE Flex Fuel System Kit w/ 1700cc Injectors, Lines, FPR, Black Fuel Rails - 2008-2021 Subaru STI

    $2,957.00
    AEM Electronics Ethanol Content Flex Fuel Sensor Kit -6AN - Universal

    2 In Stock

    30-2201

    AEM Electronics Ethanol Content Flex Fuel Sensor Kit -6AN - Universal

    $329.00
    Cobb Subaru Previous Ethanol Sensor Kit to NexGen Flex Fuel Ethanol Sensor Kit Upgrade (Module + Harness Only) - 2008-2021 Subaru STI

    5 In Stock

    315670

    Cobb Subaru Previous Ethanol Sensor Kit to NexGen Flex Fuel Ethanol Sensor Kit Upgrade (Module + Harness Only) - 2008-2021 Subaru STI

    $540.00
    COBB Subaru NexGen Stage 2 to NexGen Stage 2 + Flex Fuel Package Upgrade - 2015-2021 Subaru STI

    NEXGENFF001

    COBB Subaru NexGen Stage 2 to NexGen Stage 2 + Flex Fuel Package Upgrade - 2015-2021 Subaru STI

    $980.00
    Cobb Tuning Previous Ethanol Sensor Kit to CAN Flex Fuel Upgrade / Fuel Pressure Kit - 2018-2021 Subaru WRX

    SUB004WCAN2FFUP-P-FP

    Cobb Tuning Previous Ethanol Sensor Kit to CAN Flex Fuel Upgrade / Fuel Pressure Kit - 2018-2021 Subaru WRX

    $840.00
    COBB CAN Gateway Vehicle Harness Upgrade Kit (For Upgrading Previous Cobb Ethanol Sensor Kit) - 2018-2021 Subaru WRX

    52 In Stock

    344650-UP

    COBB CAN Gateway Vehicle Harness Upgrade Kit (For Upgrading Previous Cobb Ethanol Sensor Kit) - 2018-2021 Subaru WRX

    $735.00
    IAG PTFE Flex Fuel System Kit w/ 1050cc Injectors, Lines, FPR, Red Fuel Rails - 2008-2021 Subaru STI

    IAG-AFD-2610RD

    IAG PTFE Flex Fuel System Kit w/ 1050cc Injectors, Lines, FPR, Red Fuel Rails - 2008-2021 Subaru STI

    $2,141.28
    IAG PTFE Flex Fuel System Kit w/ 1050cc Injectors, Lines, FPR, Gold Fuel Rails - 2008-2021 Subaru STI

    IAG-AFD-2610GD

    IAG PTFE Flex Fuel System Kit w/ 1050cc Injectors, Lines, FPR, Gold Fuel Rails - 2008-2021 Subaru STI

    $2,141.28
    Cobb Tuning Previous Ethanol Sensor Kit to Subaru CAN Flex Fuel Upgrade / Fuel Pressure Kit - 2015-2017 Subaru WRX

    SUB004WCAN1FFUP-P-FP

    Cobb Tuning Previous Ethanol Sensor Kit to Subaru CAN Flex Fuel Upgrade / Fuel Pressure Kit - 2015-2017 Subaru WRX

    $840.00
    IAG PTFE Flex Fuel System Kit w/ 1700cc Injectors, Lines, FPR, Gold Fuel Rails - 2008-2021 Subaru STI

    IAG-AFD-2612GD

    IAG PTFE Flex Fuel System Kit w/ 1700cc Injectors, Lines, FPR, Gold Fuel Rails - 2008-2021 Subaru STI

    $2,957.00
    IAG PTFE Flex Fuel System Kit w/ 1300cc Injectors, Lines, FPR, Black Fuel Rails - 2008-2021 Subaru STI

    IAG-AFD-2611BK

    IAG PTFE Flex Fuel System Kit w/ 1300cc Injectors, Lines, FPR, Black Fuel Rails - 2008-2021 Subaru STI

    $2,625.61
    IAG PTFE Flex Fuel System Kit w/ 1700cc Injectors, Lines, FPR, Red Fuel Rails - 2008-2021 Subaru STI

    IAG-AFD-2612RD

    IAG PTFE Flex Fuel System Kit w/ 1700cc Injectors, Lines, FPR, Red Fuel Rails - 2008-2021 Subaru STI

    $2,957.00

    Page 1 of 2

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