The atmospheric dump valve is made from solid aluminium and hand-polished for a durable, refined appearance.
- Made from solid aluminium
- Hand-polished in the United Kingdom
- Creates the distinctive “whoosh” sound associated with rally cars
- Improves throttle response
- Increases clamping force, helping to maintain boost pressure more reliably
The valve is designed for Subaru Impreza models from 2001 onwards, including the 2009 Impreza GR STi. Once fitted, it provides an atmospheric release of charge air and the distinctive sound when the throttle is lifted, while also improving throttle response and more reliable boost pressure retention.
The kit includes:
- 1 × FMDVSUB01 valve
- 1 × 34 mm blanking plug
- 1 × Forge sticker
A spring kit for adjusting the valve is also available to tailor its operation to the engine’s requirements.
Suitable for: Subaru Forester II (SG) / III (SH), Subaru Impreza II (GD/GG) / III (GH/GR) / III (STI/GRB).
Compatible vehicles (manufacturer data)
| Vehicle | Chassis | Years | Engine |
|---|---|---|---|
| Subaru Impreza | — | 2001–2026 | —, Sti s |
Before ordering, check that the product matches your vehicle (model, year and engine). If in doubt, write to us — we will check for you.
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