COBB Tuning LF Bypass Valve

2015-2021 Subaru WRX 2014-2018 Forester XT

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SKU: 745670We price match!

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The LF Bypass Valve will hold more boost without the risk of leaking to fit the Subaru WRX and Forester XT. 
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COBB Tuning LF Bypass Valve


  • 100% Billet aluminum construction
  • 100% O-ring sealing
  • 100% Rebuildable if there ever is an o-ring failure
  • The compact design makes it ideal to fit in the confines of a light engine bay
  • The updated design uses a banjo-fitting vacuum port which provides 360-degree adjustability of hose routing
  • Includes vacuum line


COBB Tuning LF Bypass Valve

The COBB Tuning LF Bypass Valve is capable of holding very high boost pressures. This is an updated design that reduces the control volume by 30% allowing for extremely fast venting of boost pressure without the risk of leaking. If you have bolt-ons that increase the boost or horsepower, you could surpass the limits of the factory bypass valve which could leak boost and handicap your power potential. The COBB Tuning unit is super durable, with strong internal construction. 

The LF Bypass Valve is a direct replacement for the factory bypass valve and has an OEM-like flange for a simple installation. 


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2 customer reviews

Average rating
(based on 2 reviews)
Ease of Installation
Fit / Quality
Overall Satisfaction
  1. Turbo flutter galore

    By Lee October 1, 2022

    Semi-challenging install - getting the OEM one off the turbo inlet and this back on is a bit challenging while on your back, but otherwise, a simple install. The turbo flutter sounds totally make you feel like you're in a race car. So nice.

  2. Cobb LF BPV

    By JB September 23, 2022

    Cobb makes quality products. This BPV is no exception. Works with Mishimoto Charge Pipe and TMIC. Nice and compact with bulletproof construction and holds a lot of boost pressure. Recirculates charged air fast while shifting. A little expensive but worth the money. Another flawless order from Subispeed! As always repeat customer

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