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COBB Tuning LF Bypass Valve - Subaru Models (Inc. STI 2004+ / WRX 2002 - 2007)
COBB Tuning LF Bypass Valve - Subaru Models (Inc. STI 2004+ / WRX 2002 - 2007)
COBB Tuning LF Bypass Valve - Subaru Models (Inc. STI 2004+ / WRX 2002 - 2007)

COBB Tuning LF Bypass Valve

Subaru Models (Inc. STI 2004+ / WRX 2002 - 2007)

Read 3 Reviews | Q&A
Part # 712665
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Ships within 13 days

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Features & Product Details

RallySport Direct is proud to provide you with quality performance and racing products brought to you by COBB Tuning. 


Here, you are looking at the COBB Tuning LF Bypass Valve. This is a compact and lightweight by-pass valve that has been designed to hold high boost pressure without leaking. This is a great option for those with stock or heavily modified vehicles and wants a by-pass valve to be the last by-pass valve you will need.



  • Updated design reduces control volume by 30% allowing for extremely fast venting of boost when actuated
  • Compact design allows fitment in a confined engine compartment
  • Lightweight components create less inertia and can respond faster than heavier components
  • Uses banjo-fitting vacuum port which provides 360-degree adjustability of hose routing
  • Piston O-ring seal is twice the diameter of the old design allowing more seal compression and reduced wear
  • The adjustability of the spring seat is no longer needed to the updated spring and seal design which provides a 60% increase in clamping force at peak boost while maintaining similar operation at idle and transient loads




    Brand: COBB Tuning
    Color: Black / Silver
    Design: Piston
    OEM Replacement: Yes
    Valve Type: Recirculating
    Mfgr. Warranty: 1 Year
    Condition: New Product
    Return Policy:

    RallySport Guarantee - 30 Days

    Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

    RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

    The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
    RallySport Guarantee



    3 Reviews
    5 out of 5 Stars
    5 Stars
    4 Stars
    3 Stars
    2 Stars
    1 Stars
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    Superb Quality 1 year ago
    5out of 5stars

    Very solid and well-built piece of equipment. Venting feels ridiculously immediate upon release of the accelerator, which is great. I doubt that I'll ever have to replace this.
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    BPV 1 year ago
    5out of 5stars

    Solid piece, does just what it needs to and looks much better than the stock unit.
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    1 of 1 people found the following review helpful
    2007 Subaru Forester Sports XT 1 year ago
    5out of 5stars

    I decided to leave a review on this since I couldn't find any when I was shopping around. My Forester had the original stock unit despite having a VF39, other mods, and a tune. I had suspected the OEM bpv may have been struggling to hold pressure, and this install proved me right. The car instantly felt much better and sounds great. Make sure you pick up a gasket with the purchase.
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