Ford Focus Mk2 ST225 Blow Off Valve Kit
The Ford Focus Mk2 ST225 Blow Off Valve Kit is a remote blow off valve kit designed for the Ford Focus Mk2 ST225. This kit includes a twin piston valve made from billet aluminium, ensuring compatibility with the engine management system. The valve can be installed in combination with the OEM valve or on its own using one of our blanking plates.
Featuring an aluminium piston, the Forge valve is completely rebuildable and can be configured for different levels of boost pressure. This makes it suitable for use on remapped cars, allowing for easy adjustment by changing the piston preload spring inside the valve.
Unlike single piston or diaphragm diverter valves, the Forge atmospheric Blow Off valve uses counterbalanced springs and dual pistons to prevent air leakage into the intake system at idle. This ensures improved throttle response and increased clamping load to maintain boost pressure more reliably.
The dual piston design of the valve ensures longevity and allows for servicing and tuning with replacement springs if required. The kit also includes a 35mm hose clamp, a 50mm hose clamp, 500mm of 4mm vacuum tube, a 5mm T piece, a silicone hose, instructions, and a Forge sticker.
The Forge silicone hoses included in this kit are designed with an inner liner of modified silicone known as Fluorosilicone. This makes the hoses suitable for use with modern long-life coolants, Organic Acid Technology coolants (O.A.T.), or air containing oil mist. The construction of the hoses exceeds OEM fitments and enhances the engine bay both technically and aesthetically. Forge silicone hoses are backed by a lifetime warranty.
If you wish to tune this product to fit the needs of your engine, a spring tuning kit is available separately. If you have any questions about the suitability of this product for your application, please contact us.
Fitting of the Ford Focus Mk2 ST225 Blow Off Valve Kit is available at our performance workshop at Progressive Parts. Upgrade your Ford Focus Mk2 ST225 with this high-quality blow off valve kit from Forge Motorsport.




