COBB Tuning LF Bypass Valve (02-07 WRX & 2004+ STI)

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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