Blow Off Valve

The Perrin Recirculating Blow Off Valve (BOV) is engineered as a direct replacement for the stock unit on 2002-2007 Subaru WRX and 2004-2021 Subaru STI models. It addresses the limitations of the OEM BOV, such as its small outlet which restricts boost venting and can lead to leaks. The PERRIN BOV features significantly larger 1.225" inlets and outlets, ensuring efficient relief of boost pressure without inducing compressor surge. This precise sizing is crucial for balancing flow and maintaining system boost while preventing excessive venting that could negatively impact throttle response. A key feature of the PERRIN Blow Off Valve is its adjustability. The cap incorporates an adjustable spring tension system, allowing users to control both the relief pressure and the volume of air vented. This adjustability is vital for maintaining air within the boost system, preventing turbo damage from venting too little air, and avoiding throttle lag from venting too much. The system allows for independent adjustment of relief pressure and flow, providing a highly customizable experience. The body is available in a black or red anodized finish, while the cap is black anodized, offering both durability and a refined appearance. The design minimizes potential failure points and leaks. Maintenance is straightforward, requiring no special tools and allowing for service without removing the unit from the vehicle, thanks to its two O-ring seals protecting vital components. This direct-fit BOV comes pre-set for optimal performance, simplifying installation for WRX and STI owners. Benefits include faster response times, consistent boost, a perfect seal, and improved overall drivability.