This Blow Off, or dump valve mk, is for the Renault and Nissan Turbo engines that have the electronically controlled bypass valve OEM Part no. It is recommended for any vehicle where the boost pressure has been increased by an ECU software upgrade and for unmodified motorsport vehicles operating in warmer climates, as a solution to the many failures that have occurred. Unfortunately, the failure doesnt always result in a check engine light as the valve can still be blown open by the boost pressure, so you may not be aware that hoses you are losing power due to this. This prevents the diaphragm from sealing.Our alternative is a fully engineered solution offering both significantly improved reliability. The Forge valve is piston based, there is no diaphragm to fail, and of all aluminium billet construction, it replaces the original unit with a pressure/vacuum operated piston valve that still also retains the desirable OEM ECU control, over valve actuation. In The Box: 1 x FMDV23A Valve 1 x 2000mm of 4mm Vacuum Tube 1 x 50mm of 10mm Vacuum Tube 1 x 3 port Solenoid and fixings 13 x Cable Ties 1 x Uprated Red Spring 1 x 10-6-10 T Piece 1 x Forge USB Instructions 1 x Forge Keyring and Sticker. The item "Forge Motorsport Blow Off Valve for Renault Megane RS 280 & 300 Mk4" is in sale since Tuesday, May 5, 2020. This item is in the category "Vehicle Parts & Accessories\Car Tuning & Styling\Performance Suspension\Performance Coilovers". The seller is "mk-motorsport-parts" and is located in Bradford. This item can be shipped to United Kingdom, Ireland, Germany, France, Italy, Spain, Austria, Belgium, Bulgaria, Croatia, Czech republic, Denmark, Estonia, Finland, Hungary, Latvia, Lithuania, Luxembourg, Netherlands, Poland, Portugal, Slovakia, Slovenia, Sweden, Liechtenstein.