Brand: Forge Motorsport

Dump Valve for Subaru Impreza 2001 Onwards

Product code: FMDVSUB01

Please select product options and quantities below:

Out of stock
More info If you wish to rebuild or service your Forge valve we can offer a kit of parts. These kits vary with your chosen valve but typically contain a replacement piston with suitable "O"rings or diaphragm as may be required. - Read More
More info Now you can fine tune your Blow Off/Diverter Valve to the exact needs of your engine with this complete tuning kit. - Read More
More info This kit contains a range of springs suitable for tuning either the FMDVFSIT, FMDVFSITVR, FMDVVXR valves. - Read More

How to Service Your Valve

This item is out of stock but you can still purchase and we'll update you as soon as it's available to ship.


Product Description


  • 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

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.


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

from on Feb 27th 2024
Great product. Sounds awesome. No leaks after 1 year. Spring tuning kit works as advertised.

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Compatible Vehicles




Dump Valve for Subaru Impreza 2001 Onwards


Warranty Infomation

All 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.

For further information, please call our customer service team on +44(0)1452 380999 or email

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 you cooler and thoroughly rinsed away. We recommend that you should inspect your product on a regular basis 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 and added to the coolant system. Be sure you never mix coolant and always use distilled water.



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 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.

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