COBB Tuning Blow Off Valve

Part #: COB 712650


Brand: COBB Tuning
Adjustable: Yes
Color: Black
Design: Piston
Includes Gasket(s): No
OEM Replacement: Yes
QTY: 1
Valve Type: Recirculating
Mfgr. Warranty: 1 Year
Return Policy:

RallySport Guarantee - 30 Days

Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
RallySport Guarantee


The Cobb tuning Blow Off Valve which is also a hybrid valve. Hybrid blow off valves come in 3 different valve configurations.  You have fully recirculating where you utilize the provided elbow off the blow off valve where it recirculates back into the intake.  The second option is fully atmospheric which is going to give you the loudest sound, however the air does not get recirculated back into the intake, and the ECU will think the air is provided which will create a slight rich condition in between shifts.

The Hybrid option gives you a 50/50 valve.  50% vents back into the atmosphere, while the other 50% gets recirculated back into the intake. You can remove the flange plate on the rear to make that happen. 

Compared to stock, the Cobb Tuning Blow Off valve has been crafted out of high grade anodized aluminum, and overall is a better upgrade than the OEM unit whether if your supporting more boost, or if you’re stock.  The design is close to stock compared to other blow off valves as well. Overall, you will be satisfied with the Cobb Tuning Blow Off Valve.

REVIEWS ( 18 )


Verified Purchase
Light and snappy bpv
dszydel68328 11 months ago
I am stage 2 with stock turbo at 20 psi. I noticed I was only peaking 19 psi on some pulls so I ordered a go fast bits bpv. It was too heavy and I had flutter at low boost so I ordered the lighter cob piece. Super easy to install because it's 2 screws and a hose, without putting the stock nose back on. It's pretty much ready to go out of the box. I gave it 2 turns to the right to tighten up the spring a big. Vents between 2 psi and 20, holds all my boost and sounds fantastic. Obviously another great product from cobb

Not over the top!
Stevend21860717 1 year ago
Recently built my forester XT, and wanted a stock look and sound. this BOV kept the car subtle, but still gave just enough boosh to know it wasn't stock if i wanted to let people know.

Holds up 21 pounds and wants more.
Luis Pelaez 1 year ago
This valve is absolutely amazing. Installed it a month ago. I come from a WRX with the COBB BPV. And now I own an STI. Let me tell you that the stock BPV won't handle 21 psi like this COBB one. After I installed it boost felt smooth and recirculating sound was improved from stock. Now on 100:100 sounds like if it was 50:50. Perfect sound, fitment and result. Thanks RSD you guys sell nothing but the best.

Worth Every Penny!
jax2014 1 year ago
Super easy to install, includes everything you need except a gasket. Eliminates boost lag and sounds great overall! Definitely worth every penny (&the processing and shipping is fast too!)

Cobb quality
awangard.motors35013 2 years ago
Using it with FMIC setup , with 100% recirc mode - holds solid 27psi. Good product


  • AnswerQ: backfires with no tune  bjg9223949 6 months ago

    if i have a 2012 stock wrx and i put this BOV on without a tune or anything and make it 50/50 will it cause any type of back firing or anything?? i guess basically im wondering if i put it on a stock engine with 50/50 so i can get some noise from it, will it cause a back fire or any other problems?? thank you!!

    • A: 50/50 BOVs on Subarus usually cause some backfiring, but it should be minimal with this valve, and backfiring generally does not hurt anything.

      Zach G. 6 months ago

  • AnswerQ: Blow off valve  asomers7 6 months ago

    Would this blow off valve fit a 2004 WRX limited edition in the stock location?

    • A: This Cobb blow off valve is a confirmed fit for a 2004 WRX in the stock location.

      Evan M. 6 months ago

  • AnswerQ: After installing bpv  ronmaliksi00273886 8 months ago

    After installing the cobb bpv, would I have to reflash the ECU? Noob question... Thanks RSD!

    • A: Tuning is not required for BOV's, so you will be just fine to bolt this right up!

      Brady R 8 months ago

  • AnswerQ: Cobb BPV Question  ronmaliksi00273886 8 months ago

    I recently purchased the cobb BPV. Super excited to get it. Just have a quick question. What setting does it come in when you take it off the box? What do you have to do to have it be set to 50/50? Thanks rallysportdirect! Always a pleasure buying products from you guys!

    • A: The valve will come setup as full recirculating valve. To change it to a 50/50 valve all you need to do is remove the plate on the back of the valve. Once removed, only half will go out the plate and the rest will recirculate.

      Evan M. 8 months ago

  • AnswerQ: 02 WRX wagon  Connor5 12 months ago

    I bet you get these questions alot but I see you say you dont need a tune for this BOV which is confusing cause people always say you do if you get a BOV, but do you really need a upgraded turbo for this or can you run it on a Stock Turbo, and will it give me that Mad BOV sound? Cause honestly thats all im going for lol.

    • A: A blowoff valve can be used on a stock turbocharger. This is a recirculating blowoff valve in original form and will be almost silent, but if you were to remove the atmospheric backing plate you will see a bit of noise when venting to atmosphere. If sound is the priority something like the Go Fast Bits or Turbosmart valve may be the better option.

      Nick S. 12 months ago