Cobb 15-21 Subaru WRX / 14-18 FXT LF By-Pass Valve (745670)
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The COBB LF BPV (Bypass Valve) is a high-performance solution designed to withstand high boost pressure without any leaks. Its compact and lightweight design ensures efficient operation in tight engine bays. With a reduced control volume and innovative engineering, the LF BPV quickly vents boost when activated. The use of a Banjo-fitting vacuum port allows for flexible hose routing and minimizes potential leak points compared to NPT ports. The updated design includes a larger piston o-ring seal, providing better compression and reduced wear. Additionally, the improved spring and seal design increases clamping force by 60% at peak boost while maintaining optimal operation in various conditions. Installation is simplified, and the LF BPV delivers rapid response due to its low-weight components.
Original Spring (uncoated)
Free length: 3.5"
Rate: 7.4 lbf/in
Bench cracking vacuum installed in LF BPV: -5.7 psi
New Spring (yellow)
Free length: 2.25"
Rate: 40.5 lbf/in
Bench cracking vacuum installed in LF BPV: -6.7 psi
NOTES
- This is an updated version of the original 745665 LF BPV that now includes a different internal spring.
APPLICATIONS
- SUBARU WRX (2015, 2016, 2017, 2018, 2019, 2020, 2021)
- SUBARU FORESTER XT (2014, 2015, 2016, 2017, 2018)
FEATURES
- 100% Billet Aluminum Construction
- 100% O-Ring Sealing
- 100% Rebuildable if there ever is an O-ring failure
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WARNING: Operating, servicing and maintaining a passenger vehicle or off-highway motor vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to www.P65Warnings.ca.gov/passenger-vehicle.
Cobb 15-21 Subaru WRX / 14-18 FXT LF By-Pass Valve (745670)
