GFB Replacement Inlet Flange Adaptor
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GFB Replacement Inlet Flange Adaptor
GFB is well known for its diverter valves and blow off valve solutions used across the Subaru scene, and this inlet flange adaptor is a handy fix for owners running GFB valves on a Subaru WRX or STI with the triangle flange inlet. It lets you keep your existing GFB valve body while adapting it to suit a different flange pattern, saving you from buying a whole new unit.
This listing covers the 2001-2007 Subaru WRX, 2001-2007 Subaru STI, 2008-2014 Subaru STI, 2015-2021 Subaru STI and 2006-2008 Subaru Forester XT as an exact replacement adaptor. It also suits the 2003-2008 Subaru Forester XT, where it's used to convert the factory diamond flange over to the triangle flange pattern required by GFB T9000/T9100, T9200 and T9500 series valves.
Note: on the 2003-2008 Forester XT, fitting this adaptor changes the inlet from diamond flange to triangle flange, which is the reverse of most other applications listed here. This is also the part needed when upgrading an SG Forester to a Process West top mount intercooler setup.
Key Features
- Suits GFB T9003, T9103, T9203 and T9503 valve bodies
- Converts between diamond flange and triangle flange inlet patterns
- Direct bolt on adaptor, no modification required
- Allows reuse of existing GFB valve when changing flange configuration
Vehicle compatibility and fitment notes are provided in the tabs above. Please confirm your Subaru's year and flange configuration before ordering, particularly if you're converting a Forester XT for a Process West top mount.
Not sure if this adaptor suits your build? Contact our team at sales@chicaneaustralia.com.au for expert advice.
Vehicle Compatibility
| Make | Model | Chassis | Engine |
|---|---|---|---|
| Subaru | Forester XT | SG9 | EJ255 |
| Subaru | STI | GDB | EJ207 |
| Subaru | STI | GRB | EJ257 |
| Subaru | STI | VAB | EJ257 |
| Subaru | WRX | GDB | EJ205/EJ255 |
Technical Specifications
| Spec | Value |
|---|---|
| Compatible Units | GFB T9003 / T9103 / T9203 / T9503 |
| Flange Type | Triangle-flange (adaptor converts diamond-flange to triangle-flange) |
No instructions available for this product.

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