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COBB LF Bypass Valve 2002-2007 WRX / 2004-2021 STI / 2006-2008 FXT

SKU 712665
Original price $345.00 - Original price $345.00
Original price
$345.00 - $345.00
Current price $345.00

The C.A.R.B. Certified COBB LF BPV is a compact and lightweight by-pass valve that is capable of holding very high boost pressure without leaking. Its updated design reduces control volume by 30% allowing for extremely fast venting of boost when actuated. Innovative engineering and precision manufacturing result in a compact package able to fit in the confines of a tight engine bay. Due to the low weight of the components, the moving parts in the LF BPV have less inertia and can respond faster than heavier components in other bypass valves. This updated design uses a Banjo-fitting vacuum port which provides 360 degree adjustability of hose routing. This results in a simpler install and less potential leak points than the NPT ports. This new design also includes a piston o-ring seal that is twice the diameter of the old design allowing more seal compression and reduced wear. Adjustability of the spring seat is no longer needed due 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.

Customer Reviews

Based on 12 reviews
John R

Swapping out my TMIC so I decided to swap the bypass valve along with it. Build quality is great and I'm sure it'll function just like stock if not better


Upgrading your TMIC is a fantastic mod and it is the perfect time to swap out the bypass valve as well! We are confident the COBB LF Valve will function better, than OEM! Thank you for taking the time to leave a 5 Star Review! Enjoy your upgrades and happy driving!


Scott Ayers
Amazing product, absolutely love it!

Cobb has made an incredible BPV, it’s a perfect fit, looks amazing and holds boost so much better than the OEM BPV. I absolutely love it!

Thank you for your positive feedback on the COBB LF Bypass Valve! We are thrilled to hear that you are loving the product and that it is performing better than the OEM BPV. We appreciate your support and hope you continue to enjoy the product. Thank you for choosing Subimods!


Excellent product, easy install. I absolutely love it


Thank you for your positive feedback and 5 Star Review of the COBB LF Bypass Valve! The Subimods Team is delighted to hear that you find it to be an excellent product with an easy installation process. It is designed with performance in mind with updated internals and low weight housing! You can't go wrong! Enjoy!



Easy install and more pull


Thank you for your 5 Star Review of the COBB LF Bypass Valve! We are pleased to hear that the installation process was straightforward for you. It is great to know that you have experienced an improvement in performance with more pull after installing the bypass valve. At Subimods, we aim to provide quality aftermarket Subaru parts to enhance your driving experience! Enjoy!


Tanner Pratt

I paired this with a Grimm speed boost controller and turbo smart waste gate and it sounds amazing. Install was very easy and it came fast. 100% recommend


Thank you for sharing your positive experience with the COBB LF Bypass Valve! It's great to hear that the installation was easy and that you're happy with the sound. Pairing it with other components like the Grimm speed boost controller and turbo smart waste gate are great options! Thank you for your 5 Star Review and added video!


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