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Description
Product Description
Highlights:
- Made from billet aluminium for durability
- Hand polished in the UK for a sleek appearance
- Creates the iconic "Whoosh" sound associated with rally cars
- Improves throttle response
- Increases clamping load to maintain boost pressure reliably
- Designed, manufactured, and assembled in the UK
- Lifetime warranty
An Alloy Atmospheric Dump Valve specifically designed to fit Subaru Impreza models from 2001 onwards, including the 2009 GR STi. This high-quality valve is made from billet aluminium and hand polished in the UK to ensure durability and a sleek appearance. By installing this atmospheric diverter valve, you can experience the iconic "Whoosh" sound that is commonly heard in rally cars when the throttle is lifted. Not only does it add an exciting auditory experience, but it also improves throttle response and increases clamping load to maintain boost pressure more reliably.
⭐ I bought this product and got to say sounds really good nice blow off noise and looks very impressive when lift the bonnet great quality and service ⭐
In The Box:
1 x FMDVSUB01 Valve
1 x 34mm Blanking Plug
1 x Forge Sticker
If you want to customize this valve to better suit the needs of your engine, we offer a spring tuning kit that allows for easy adjustments. If you have any questions or are unsure if this product is suitable for your application, feel free to contact us for assistance.
Please Note: In line with our policy to constantly review, revise, and improve our product range, the appearance of the product you receive may differ from the one advertised.
Product Reviews
Product Reviews
Great product. Sounds awesome. No leaks after 1 year. Spring tuning kit works as advertised.
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Compatible Vehicles
Instructions
Dump Valve for Subaru Impreza and Forester 2001 Onwards
Warranty
Warranty Information
The majority of Forge Motorsport products come with a limited lifetime warranty. All warranty claims must be accompanied by the original proof of purchase to enable us to help you — failure to supply this proof will result in your claim or enquiry being denied. Please note that some products are excluded from the Forge lifetime warranty and instead carry their own specific warranty terms — for example, air filters, electrical components, coil packs, carbon fibre products, and suspension kits. This page is a summary only; a full and current list of exclusions, along with their specific warranty terms, can be found on our Terms & Conditions page.
For further information, please call our customer service team on +1 865 951 7456 or email sales@forgemotorsport.com
Do not use aggressive (acidic) car cleaning products, particularly traffic film remover solutions or shampoos, to clean your intercooler, radiator, or oil cooler. The use of these products can damage Forge Motorsport cooling systems and invalidate your warranty. These are often found at car washes. A light, warm, soapy solution (free of harsh acidic cleaning compounds) should be used to clean your cooler, and thoroughly rinsed away afterwards. We recommend that you inspect your product regularly for bent and/or crushed fins — any bent fins should be carefully straightened to allow ambient air to pass through the core face. At the time of installing your Forge radiator, an approved coolant must be used. Be sure you never mix coolant types, and always use distilled water.
This warranty does not apply to any defect in the goods arising from fair wear and tear, wilful damage, accident, negligence by you or any third party, use otherwise than as recommended by the supplier, failure to follow the supplier's instructions, or any alteration or repair carried out without the supplier's approval.
This does not affect your statutory rights.
Ignition Coil Packs
Forge ignition coil packs carry a 12 month warranty against manufacturing defects (not our Lifetime Warranty), from date of purchase. As coil packs are often swapped as a full set on suspicion rather than a confirmed fault, claims must identify the specific faulty unit(s) with supporting evidence (e.g. a diagnostic misfire code) and proof of purchase. Full sets cannot be claimed without this. See full terms and conditions for details.
Electrical Components
Electrical components supplied with Forge Motorsport kits — including solenoids, wiring harnesses and looms — are covered by a 12 month warranty against manufacturing defects, rather than our standard Lifetime Warranty. This covers faulty materials or workmanship only, and does not cover damage from incorrect installation, water ingress, wear, incorrect wiring, or faults originating from your vehicle's own electrical system or other aftermarket electrical accessories. Full terms, including how to make a claim, are available in our Terms & Conditions.
Heat Management Products (Turbo Blankets and Gold Reflective Heat Barrier)
Turbo blankets and our gold reflective heat barrier are covered by a 6 month warranty against manufacturing defects (not our Lifetime Warranty), from date of purchase. Turbo blankets cure and lose flexibility over their first few heat cycles as a normal part of fitting. Once heat-cycled they should not be removed. The gold reflective heat barrier is designed for components such as engine covers, intake pipes and induction trays, not for direct contact with exhausts or turbine housings. See Terms & Conditions for details.
Shipping
Shipping
USA Deliveries
All Deliveries are sent via Fedex. We cannot guarantee delivery timelines as all orders are up to shipper schedules and routes. Delivery fee is a Flat Rate of $20 fo all orders over $20. Orders below that value are costed out based on weight. Signature required may be added to your package. Orders can not be re-directed, held, or re-scheduled.
Shipping outside of the Lower 48- Duty Charge Information
All Forge products are sold with a Delivery Duty Unpaid (DDU) status and an import tariff may apply to your order. Customers will be contacted by the Customs and Excise authority in the destination country regarding payment prior to delivery, and it is important that correct contact telephone number and email information be submitted with the order to facilitate this part of the delivery process.
Our shipping methods ensure safe and timely delivery of your new Forge products. For further information on cost and delivery times, please contact Forge using the info@forgemotorsport.com email address if you require any more information. We reserve the right to change the delivery service and company at any time.
***Once a product has left our warehouse and is in the possession of the shipping company, any claims must be made directly with that shipper however we can assist with most cases.
