The Blow-Off valve (BOV) is a pressure relief device on the intake tract to prevent the turbos compressor from going into surge. When the throttle is closed rapidly, the airflow is quickly reduced, causing flow instability and pressure fluctuations. Surge can eventually lead to thrust bearing failure due to the high loads associated with it. Blow-Off valves use a combination of manifold pressure signal and spring force to detect when the throttle is closed. When the throttle is closed rapidly, the BOV vents boost in the intake tract to atmosphere to relieve the pressure, helping to eliminate surge.
Type: Bolt-On, Pressure Tolerance: Holds Up to 30 PSI Boost Pressure
Draw In Surrounding Air And Release A Unique Discharge Sound
High-Quality Diaphragm And Short Stroke Significantly Increase Response
Weldable Aluminum Flange, Anodized Aluminum Top Finish
Easy to Remove Locking Collar for Fast Spring Changes
Professional Installation is Highly Recommended (No Instruction Included)
05-09 Subaru Legacy
This is not a direct bolt-on item for stock engine setup, Minor modifications or adjustments may be needed for this Blow Off Valve. Installation instruction not included. Professional installation strongly recommended for high performance/racing automotive parts. Please excuse us from any possible typos and unintentional misinterpretations. You are more than welcome to contact us for questions and concerns. Thank you!.
1x Blow Off Valve Kit Hardware if Any is Shown in the Picture Above