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GrimmSpeed V2 Bypass Valve 2004-2021 STI / 2002-2007 WRX

SKU 126032BLK
Original price $249.00 - Original price $249.00
Original price
$249.00 - $249.00
Current price $249.00
Select Color: Black


The GrimmSpeed V2 Bypass Valve received many upgrades such as a redesigned the internal piston to eliminate the potential failure points we saw in our V1 design. We 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. This valve is engineered for high performance finished in a premium gloss black or red.


This upgraded V2 Bypass Valve by GrimmSpeed is an easy mod that you can do in just minutes. With a red or black finish this bypass valve is engineered to work better than the stock one and give your engine bay some bling. 


  • CNC-Machined 6061 Aluminum

  • Corrosion resistant anodized finish, available in both red and black

  • Oversized 38mm brass piston for superior flow

  • Precision-tuned steel spring for long life

  • No tuning or adjustment required

  • Single dovetail O-ring grooves with Buna-N O-rings for great oil resistance, retention, and leak free operation

  • Swivel air fitting to aid in install and for accommodating custom setups


2002-2007 WRX

2004-2021 STI

Customer Reviews

Based on 2 reviews
Philip Sayavongsing

GrimmSpeed V2 Bypass Valve 2004-2021 STI / 2002-2007 WRX

Vince Malone
It’s amazing!

Best purchase for something that’s direct bolt on! Strongly recommended if you want to replace your own bpv for something that makes more sound and better quality!

Thanks for your review, Vince!