Unfortunately, the failure doesn't 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 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 FMDV23R 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. If you wish to tune this product to fit the needs of your engine, please see the spring tuning kit below. This fits the following vehicles: [car_parts_fittings]. We are a small business and as such there may be occasions when we are unable to fulfil the order due to issue out of our control so please bear with us!