GFB Respons Dual Port Variable Blow Off Valve
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GFB Respons Dual Port Variable Blow Off Valve - Subaru WRX/STI (GC8) MY99-00 / Forester GT (SF) / Forester XT (SG) MY03-05 / Liberty B4 (BE/BH)
GFB pioneered the dual port blow off valve back in 1999, and the Respons takes that concept further with a patented venting bias adjustment system. It lets you dial in exactly how much air vents to atmosphere versus recirculating, giving you the blow off sound you want without the stalling or over-fuelling issues that plague sensitive MAF based cars. Fitted to your Subaru WRX, STI, Forester or Liberty B4, it also improves throttle response and boost recovery between gearshifts.
This listing covers the GC8 chassis WRX and STI (MY99-00), Forester GT (SF), Forester XT (SG) MY03-05, and Liberty B4 (BE/BH). It's a direct bolt-on kit into the factory location with no modifications required.
Important: This valve is only compatible with vehicles using the Diamond flange. Triangle flange equipped vehicles require part T9503 instead — check your factory BOV flange shape before ordering.
Key Features
- Patented venting bias adjustment — from 100% recirculating to 100% atmosphere venting
- Balanced piston design prevents the valve being forced open under high boost
- GFB TMS operating principle — stays shut until required to open
- Up to 30% faster boost recovery on gearshift versus a factory diverter valve
- Direct bolt-on fitment, no adaptors or modifications required
- SKU: T9000
Vehicle compatibility, OEM part numbers, and fitment notes are provided in the tabs above. Please confirm your vehicle's year and factory BOV flange type 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 GT | SF | - |
| Subaru | Forester XT | SG | - |
| Subaru | Liberty B4 | BE/BH | - |
| Subaru | STI | GC8 | - |
| Subaru | WRX | GC8 | - |
Technical Specifications
| Spec | Value |
|---|---|
| Valve Type | Dual Port Variable Blow Off Valve (Respons TMS) |
| Piston Design | Balanced piston (boost pressure equalised on both sides to prevent forced opening at high boost) |
| Venting Adjustment | Variable bias — adjustable from 100% recirculation to 100% atmosphere venting via adjusting ring |
| Flange Type | Diamond flange (Forester XT MY03-05 only — Triangle flange requires GFB T9503) |
| Installation Type | Direct bolt-on, fits factory location, no modifications required |
| Boost Recovery | Up to 30% faster than a factory diverter valve on gearshift (GFB test claim) |
No instructions available for this product.
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