More washers will make the spring tighter in the BOV. If you have increased boost, then you want to add more washers to keep the BOV from opening too soon from not having the spring tight enough. These valves come with 4 washers installed for factory set cars. If you have modifications, you will want to monitor your boost and make sure it doesn't taper off under high load.
TurboXS Hybrid Blow Off Valve Type XS - 2015-2021 Subaru WRX
TurboXS Hybrid Blow Off Valve Type XS - 2015-2021 Subaru WRX
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TXSW15-XS-HYB
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TXSW15-XS-HYB
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TXSW15-XS-HYB
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TXSW15-XS-HYB
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TXSW15-XS-HYB
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TXSW15-XS-HYB
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TXSW15-XS-HYB
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TXSW15-XS-HYB
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TXSW15-XS-HYB
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TXSW15-XS-HYB
TurboXS
TurboXS Hybrid Blow Off Valve Type XS - 2015-2021 Subaru WRX
TurboXS Hybrid Blow Off Valve Type XS - 2015-2021 Subaru WRX
Couldn't load pickup availability
Not too loud and not too quiet, the W15-XS-HYB from TurboXS is the valve for you if you want an upgraded Blow Off Valve that you can hear when you want to but not when you don't. Designed specifically for the 2015 WRX using our all new "XS" BOV platform, this valve is designed to vent partly to atmosphere and partly back to the intake giving you the "best of both worlds". This valve comes complete with everything you need to replace your stock bypass valve.
This product makes it much easier to make a BOV one of your first modifications.
Note: The BOV is intended to work with a stock tune and no other modifications. When other modifications are added, an updated tune is recommended.
TurboXS Hybrid Blow Off Valve Installation
FAQ

| Specification | Value |
|---|---|
| Color | Red |
| Adjustable | Yes |
| Design | Piston |
| Finish | Anodized |
| Qty | 1 |
| Valve Type | Hybrid |
I am highly satisfied with the purchase. I had the Boomba BPV and this one is 100% better.
Do I need and after market intake or anything else in order to hear the blow off valve venting air? I just installed the turboxs hybrid in my 2016 wrx but isn’t making any noise? Help?
This was a simple part to add and sounds great. No check engine lights and car runs great. Excellent video by Subispeed showing the install making it that much easier to get in and the car back on the road.
Installed 15 WRX. Great quality and somewhat easy installation. Make great sound once installed. My car has NO Cobb access and this is the first mod to engine. I have seen NO engine light and car runs fine. Would recommend this product.
I installed this the same time I installed the Cobb Big SF intake and it was relatively easy. First you get the sucking noise of the intake and turbo and then whoosh! Exactly what you expect a car with a turbo to sound like. I highly recommend.