Introductions: The Blow-Off valve (BOV) is a pressure relief device on the intake tract to prevent the turbo's 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. Features: 1. Billet Aluminum Body 2. 8 Discharge Ports That Draw In Surrounding Air and Release a Unique Discharge Sound 3. 40mm, Hard-Anodized Valve for Increased Airflow 4. Dual Spring System Promoted Response and Allows for High Boost Pressures 5. Holds Up to 30 PSI Boost Pressure 6. Aggressive JDM Racing Discharge Sound 7. 2 Bolt Mounting DesignPackage Includes: 1 x Type-RS Blow Off Valve Kit 1 x Aluminum Flange PipeDoes NOT fit models with California Emission Standards (Not legal for sale in CA and NY. If your vehicle is registered in California, do not purchase this part. If your vehicle meets California requirements, but is not registered in California, this converter will work on your vehicle. Return Policy All of our items come with a 30-day free return policy. If you need to return, please contact us, let us know the detailed problem and send us some pictures for confirmation. We reserve the right to refuse any returns for objective reasons. Shipping Policy All of our items are shipped free with tracking numbers. Orders will be shipped within 3 working days upon receipt of payment. Most orders will be shipped within 1 working day. In most cases, shipping takes 8-12 working days.