An Alloy Atmospheric Dump Valve to fit the Subaru Impreza 2001 onwards models including the 2009 GR STi. Made from billet aluminium and hand polished in the UK, this atmospheric diverter valve dumps the charge-air to atmosphere creating the "Whoosh" sound most commonly associated with rally cars when the throttle is lifted. This increases both quicker throttle response and higher clamping load to maintain boost pressure more reliably. In The Box: 1 x FMDVSUB03 Valve 1 x Forge Sticker.We use DPD 24hr service. Despatch times can vary, depending on what you have ordered. But if the item is going to be delayed longer than 24 hours we will contact you. The item "Forge Motorsport Dump Valve for Subaru Impreza 2001 On Including 2009 FMDVSUB01" is in sale since Thursday, November 8, 2018. This item is in the category "Vehicle Parts & Accessories\Car Tuning & Styling\Other Car Tuning & Styling". The seller is "darkside-dynamics" and is located in Gloucester. This item can be shipped worldwide.