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Grimmspeed V2 Bypass Valve Black 2015-2021 WRX / 2014-2018 Forester XT

SKU 126033BLK
Original price $249.00 - Original price $249.00
Original price
$249.00 - $249.00
Current price $249.00

The long-awaited return of the GrimmSpeed Bypass Valves is here! Our valves have been a highly sought-after product, but due to the intensive assembly process, it has been hard to keep them on the shelves, which in turn causes frustration among our customers. To address this issue, our team has worked diligently to redesign the BPV to make the assembly process more efficient, while also improving its manufacturability, performance, and overall reliability.

What's New for Version 2?

  • Redesigned the internal piston to eliminate the potential failure points we saw in our V1 design.
  • Adjusted tension of the internal spring to better suit the operating environments we've seen after further testing and development.
  • Updated the design of the main body for a better CNC milling finish.
  • Exchanged the internal brass piston from V1 for a lighter weight hard aluminum piston, resulting in better valve response.
  • Removed the inspection port which was primarily used for quality control, but it is not required with the new design.

In testing of stock bypass valves, we saw repeated internal leakage at boost levels as low as 8psi in the FA20 and 19psi in the EJ variant. As always the case with GrimmSpeed Products, we focus on form AND function, and these units are no exception. We aimed to create an extremely durable bypass valve that could hold double the pressure of the stock unit, while still being a stylish part that compliments the other GrimmSpeed Parts under your hood.


  • CNC-Machined 6061 Aluminum
  • Corrosion resistant anodized finish, available in both red and black
  • Oversized 38mm anodized aluminum piston for superior flow
  • Swivel air fitting to aid in install and for accommodating custom setups
  • No tuning or adjustment required


  • 2015-21 Subaru WRX
  • 2014-18 Subaru Forester XT

Customer Reviews

Based on 4 reviews
Alfonso V
Grimmspeed V2 is a great bpv!

Nice quality bpv by grimmspeed looks and sounds great! Fitment with my Cobb cast turbo inlet wasn’t great. I wanted the Cobb cast turbo inlet as it has slightly more volume because of the port matched turbo side than the gs. But what should’ve been an easy install was a pita. Maybe upgrading the charge pipe would help but in hindsight I would probably just use the Cobb bypass valve instead of the gs as it doesn’t fit great with the Cobb inlet. I really had to finagle it to get the gs bpv to mount to the cobb inlet and fit the charge pipe. If you’re dead set on this bpv I would definitely buy the grimmspeed turbo inlet or you’ll be fighting to get this mounted on the cobb inlet like I did.


Thank you for your 5 Star Review and added pics! It is great to hear that the Grimmspeed V2 Bypass Valve in black is of high quality and looks and sounds great! Your detailed feedback will be valuable for others considering similar setups. Thanks for sharing your insights! Enjoy!


robert burklund
Amazing product

Has made my daily driver FA20 an absolute blast to be in everyday!


Thank you for taking the time to leave a 5 Star Review! We are thrilled to hear that you are enjoying our Grimmspeed V2 Bypass Valve on your WRX. It is great to know that it has enhanced your driving experience. We appreciate your support and hope you continue to have a blast behind the wheel. Happy driving!


Peter Hachmeister

Grimmspeed Bypass Valve Black 2015-2021 WRX


We appreciate your 5 Star Review of the Grimmspeed Bypass Valve!


Devante James
GRIMMSPEED bypass valve

Best purchase hands down


The Grimmspeed BPV is definitely a fantastic purchase! The CNC machined billet 6061 aluminum alloy construction and massive 38mm piston ensures quality and performance! The best part no tuning or adjustments are necessary! Thank you for your 5 Star Reivew!


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