GrimmSpeed V2 Bypass Valve (04-21 STI & 02-07 WRX)

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  • Regular price $249.00
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  • CNC-Machined 6061 Aluminum: Precision-engineered for strength and durability.
  • Corrosion-Resistant Anodized Finish: Red anodized finish for a stylish appearance and corrosion resistance.
  • Oversized 38mm Aluminum Piston: Superior flow for quick pressure release.
  • Precision-Tuned Steel Spring: Ensures long life and optimal performance.
  • Swivel Air Fitting: Facilitates easy installation and accommodates custom setups.
  • Single Dovetail O-Ring Grooves: Equipped with Buna-N O-rings for excellent oil resistance, retention, and leak-free operation.
  • No Tuning or Adjustment Required: Hassle-free operation without the need for tuning.


  • New for Version 2:

    • Redesigned Internal Piston: Eliminates potential failure points seen in the V1 design.
    • Adjusted Spring Tension: Better suited for operating environments after extensive testing.
    • Improved CNC Milling Finish: Updated main body design for enhanced aesthetics.
    • Lightweight Hard Aluminum Piston: Replaces internal brass piston for improved valve response.
    • Removal of Inspection Port: Quality control feature no longer required with the new design.


  • 2004-2021 Subaru STI
  • 2002-2007 Subaru WRX
  • 2006-2008 Subaru Forester XT
  • 2004-2005 Subaru Forester XT (with STI-Style TMIC)
  • 2004-2006 Subaru Baja XT (with STI-Style TMIC)