GrimmSpeed Version 2 Bypass Valve
Not sure which option fits your application? Contact Us — we're happy to help.
Request a Price Match
Found it cheaper elsewhere? Send us the details and we'll do our best to match it.
Request received
Thanks! Our team will review it and be in touch shortly.
GrimmSpeed Version 2 Bypass Valve - Subaru WRX (GDA/GGA) / STI (GDB/GRF/GVF/VAB)
GrimmSpeed has redesigned its popular bypass valve from the ground up, addressing the failure points seen in the original release while improving flow and response. Built for the Subaru WRX (GDA/GGA) and WRX STI (GDB/GRF/GVF/VAB), this V2 valve is CNC machined from billet aluminium and engineered to handle far more boost pressure than the factory unit without leaking.
This listing covers the GrimmSpeed Version 2 Bypass Valve for the Subaru WRX (GDA/GGA) and WRX STI (GDB/GRF/GVF/VAB). It's available in Black (GRM126032BLK) and Red (GRM126032RED) anodised finishes, selectable from the variant options on this listing.
Note: The STI application reuses the factory recirculation elbow for correct alignment, giving a plug and play fit without extra hardware.
Key Features
- CNC machined billet 6061 aluminium body and base
- Corrosion resistant anodised finish in black or red
- Oversized 38mm aluminium piston for quick boost venting
- Precision tuned steel spring, no tuning or adjustment required
- Buna-N O-rings with dovetail grooves for secure sealing
- Swivel air fitting for easier installation and custom routing
- Rated to withstand roughly double the pressure of the factory valve
Vehicle compatibility, OEM part numbers, and fitment notes are provided in the tabs above. Please confirm your vehicle's model year and intercooler configuration before ordering.
Not sure if this valve suits your build? Contact our team at sales@chicaneaustralia.com.au for expert advice.
Vehicle Compatibility
| Make | Model | Chassis | Engine |
|---|---|---|---|
| Subaru | Forester XT | - | |
| Subaru | WRX STI | GDB/GRF/GVF/VAB | - |
| Subaru | WRX | GDA/GGA | - |
Technical Specifications
| Spec | Value |
|---|---|
| Body & Base Material | Billet 6061 aluminium alloy, CNC-machined |
| Finish | Anodised (black or red) |
| Piston Diameter | 38mm |
| Piston Material | Source data conflicts — described as both a lightweight hard aluminium piston (V2 update) and a machined brass piston elsewhere in the same listing |
| Spring | Precision-tuned steel spring, no tuning/adjustment required |
| O-Ring Material | Buna-N |
| O-Ring Groove Design | Single dovetail groove |
| Fitting Type | Swivel air fitting |
| Pressure Capacity | Rated to hold approximately double the pressure of the stock bypass valve |
| Stock BPV Leak Point (for reference) | 8 psi (FA20), 19 psi (EJ variant) |
| STI Fitment Note | Reuses factory recirculating elbow for alignment and fit |
No instructions available for this product.
Need Help Finding the Right Part?
We’ll Track It Down for You
We know how frustrating it can be searching for the right part. If it’s not listed on our site, that doesn’t mean we can’t source it.
Fill out the quick form below and our team will track it down for you.