Cobb LF Bypass Valve | 2002-2007 Subaru WRX, 2004-2021 Subaru WRX STI, and 2006-2008 Subaru Forester XT (712665)
Cobb Tuning2002-2007 Subaru WRX, 2004-2021 Subaru WRX STI, and 2006-2008 Subaru Forester XT LF Bypass Valve by Cobb Tuning
The 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.
Features
- Capable of holding very high boost pressure without leaking.
- Reduces control volume by 30% allowing for extremely fast venting
- Compact package able to fit in the confines of a tight engine bay.
- Moving parts in the LF BPV have less inertia and can respond faster than heavier components in other bypass valves
- Uses a Banjo-fitting vacuum port which provides 360 degree adjustability of hose routing
- Includes a piston o-ring seal that is twice the diameter of the old design allowing more seal compression and reduced wear
- Spring & seal design increase clamping force by 60% at peak boost while maintaining similar operation at idle and transient loads
Applications
- 2002 - 2007 Subaru WRX
- 2004 - 2020 Subaru STI
- 2006 - 2008 Subaru Forester XT
What's In The Box?
- 1 - Cobb LF BPV
- 1 - Hose
References
Warranty
- COBB Tuning Products, LLC warrants to the original retail purchaser that all components manufactured by COBB Tuning, or sold under the COBB brand from an Authorized COBB Tuning dealer, hold a 12-month limited warranty from the date of purchase against defects in materials and workmanship.
Customer Reviews
Bought it couple months back, to me by far the best bpv from cobb. the quality of the bpv is on point cobb never disappoints. i do feel my sti responds and runs better with it compared to the stock bpv. if your looking for a bpv that makes more noise this is not it. im running redline carbon fiber intake and grimmspeed tmic on my 21 sti. it does make a small change to the noise from the intake but not too much.
Brought my subie used, had another aftermarket BOV. Needed a new one for my etune. MA performance was able to ship this item fast. Easy install.
Much needed fits perfect
Looks great! Map got it here fast. Super easy install, highly recommend.
I had to break the plastic piece holding the vacuum line in please and move it up out of the way to get this to fit, and even then it seems to crush the pcv li e running next to it. Defitely a tight fit with slight modification required, but it work well other than that.
