Redesigned from the ground up, this valve from Grimmspeed addresses the limitations of the previous version, improving manufacturability, performance, and reliability while maintaining the high-quality look and feel GrimmSpeed is known for.

What’s New in Version 2?

• Redesigned internal piston to eliminate potential failure points from V1
• Optimized spring tension for superior response across all operating conditions
• Updated main body design for a cleaner CNC finish
• Lightweight hard aluminum piston replaces brass for faster valve response
• Inspection port removed for a more streamlined design
• Built to hold double the pressure of stock bypass valves while remaining leak-free

Material & Design

• CNC-Machined 6061 Aluminum Body: Strong, lightweight, and anodized in black or red for corrosion resistance and style
• Oversized 38mm Piston: Quickly dumps pressure while maintaining leak-free operation, even at high boost levels
• Precision Steel Spring: No tuning or adjustment required for immediate performance
• Buna-N O-Rings with Dovetail Grooves: Superior retention and resistance to fuel and oil degradation
• Swivel Air Fitting: Simplifies installation and accommodates custom setups
• Signature GrimmSpeed Branding: Stylish and recognizable under the hood

Fitment:

• 2004-2021 Subaru STI
• 2002-2007 Subaru WRX
• 2004-2008 Subaru Forester XT (2004-05 Forester XT require STI-Style TMIC)
• 2004-2006 Subaru Baja XT (requires STI-Style TMIC)