BOV PowerPort 4InHg SpringBOV PowerPort 4InHg Spring The BOV PowerPort 4InHg Spring is a genuine Turbosmart blow off valve engineered to improve boost response, throttle lift control and reliability in high performance turbo applications. Turbosmart's PowerPort Spring is a 4InHg spare designed to provide the ultimate performance, reliability, and drivability. The Turbosmart PowerPort Spring helps regulate air pressure in your vehicle's intake system, ensuring optimal airflow
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