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  • Radium Fuel Pressure Regulator Kit | 2008-2019 Subaru STi (20-0265)
  • Radium Fuel Pressure Regulator Kit | 2008-2019 Subaru STi (20-0265)
  • Radium Fuel Pressure Regulator Kit | 2008-2019 Subaru STi (20-0265)
  • Radium Fuel Pressure Regulator Kit | 2008-2019 Subaru STi (20-0265)
  • Radium Fuel Pressure Regulator Kit | 2008-2019 Subaru STi (20-0265)
  • Radium Fuel Pressure Regulator Kit | 2008-2019 Subaru STi (20-0265)

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    Radium Engineering

    Radium Fuel Pressure Regulator Kit | 2008-2019 Subaru STi

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    2008+ STi Fuel Pressure Regulator Kit by Radium

    This kit is designed for use in the USDM 2008-2017 Subaru WRX STi (EJ257 only) and replaces the OEM fuel pressure regulator and damper assembly. The factory STi fuel line routing uses a quasi dead-end system that circulates fuel through the regulator, bypassing the engine. Fuel is only routed to the engine when there is demand.

    The Radium FPR kit replaces the factory regulator and re-routes fuel to cycle through the engine's rails before reaching the regulator, and returning to the tank. This is the preferred fuel line routing by Subaru tuners trying to address stumbling issues. The Radium Fuel Pressure Regulator offers adjustment from 20psi-up with a 1:1 vacuum reference. Interchangeable orifices allow the user to tune the regulator for any fuel pump flow.

    The kit installs in the same location as the OEM fuel pressure regulator. Also included are vacuum hose and fittings to re-route the vacuum reference line from the #4 cylinder runner to the intake manifold plenum for a more stable vacuum signal.

    Features

    • Replaces the factory regulator and re-routes fuel to cycle through the rails before reaching the regulator
    • adjustment from 20psi-up with a 1:1 vacuum reference
    • Interchangeable orifices allow the user to tune the regulator for any fuel pump flow
    • installs in the same location as the OEM fuel pressure regulator
    • Includes vacuum hose and fittings to re-route the vacuum reference line from the #4 cylinder runner to the intake manifold plenum for a more stable vacuum signal

    Also available are 2 options for the fuel pressure regulator top color.

    Applications

    • 2015 - 2019 Subaru WRX STI
    • 2008 - 2014 Subaru Impreza WRX STi

    What's In The Box?

    • 1 - Fuel Pressure Regulator
    • Plumbing, Fittings & Hardware

    References

    Warranty

    • Manufacturer's Warranty

    2008+ STi Fuel Pressure Regulator Kit by Radium

    This kit is designed for use in the USDM 2008-2017 Subaru WRX STi (EJ257 only) and replaces the OEM fuel pressure regulator and damper assembly. The factory STi fuel line routing uses a quasi dead-end system that circulates fuel through the regulator, bypassing the engine. Fuel is only routed to the engine when there is demand.

    The Radium FPR kit replaces the factory regulator and re-routes fuel to cycle through the engine's rails before reaching the regulator, and returning to the tank. This is the preferred fuel line routing by Subaru tuners trying to address stumbling issues. The Radium Fuel Pressure Regulator offers adjustment from 20psi-up with a 1:1 vacuum reference. Interchangeable orifices allow the user to tune the regulator for any fuel pump flow.

    The kit installs in the same location as the OEM fuel pressure regulator. Also included are vacuum hose and fittings to re-route the vacuum reference line from the #4 cylinder runner to the intake manifold plenum for a more stable vacuum signal.

    Features

    • Replaces the factory regulator and re-routes fuel to cycle through the rails before reaching the regulator
    • adjustment from 20psi-up with a 1:1 vacuum reference
    • Interchangeable orifices allow the user to tune the regulator for any fuel pump flow
    • installs in the same location as the OEM fuel pressure regulator
    • Includes vacuum hose and fittings to re-route the vacuum reference line from the #4 cylinder runner to the intake manifold plenum for a more stable vacuum signal

    Also available are 2 options for the fuel pressure regulator top color.

    Applications

    • 2015 - 2019 Subaru WRX STI
    • 2008 - 2014 Subaru Impreza WRX STi

    What's In The Box?

    • 1 - Fuel Pressure Regulator
    • Plumbing, Fittings & Hardware

    References

    Warranty

    • Manufacturer's Warranty

    Customer Reviews

    Based on 3 reviews
    100%
    (3)
    0%
    (0)
    0%
    (0)
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    T
    T.
    Frp regulator

    It’s a beautiful product . If ur planning to buy . Get the gauge kit together. I also hope that there is bracket made for this particular application. Overall it is a great product

    M
    M.w.
    Radium fpr kit

    It’s easy to instal and helps take away fuel stumble sti are known for.

    H
    H.K.j.
    Great product

    So with any 08+ Subaru going for 400+ whp we run into the stumble problem. After installing and a bit of tune adjusting it’s no longer there. Fitment was tight but the quality of the product was incredible. Over all I’d give this 10/10

    MAP Limited Lifetime Warranty

    1.) All MAPerformance in-house fabricated parts include a Limited Lifetime Warranty for the Original Purchaser. This warranty only applies to the original purchaser and is non-transferrable. If the product fails it would need to be determined by MAPerformance that it is due to manufacturing defects in materials or workmanship.

    2.) This does not cover normal wear and tear. Improper use, modification, or abuse voids this warranty. MAPerformance will not be held responsible for additional costs due to the failure of a product (cost of sale, towing, labor, etc.). Warranty claims must be submitted to MAPerformance for review.

    3.) You must create a support ticket to acquire your return authorization number prior to returning the product.

    4.) Warranty claims will not be honored if the product was not purchased through an approved dealer.

    For warranty evaluation please create a support ticket via this form here.

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