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 and boost control for maximum engine efficiency. Built with Turbosmart's superior engineering and superior quality, this spring provides reliability and long-term performance you can count on. With its strong construction, Turbosmart's PowerPort Spring will keep your car running at peak power for years. Get the most out of your ride with Turbosmart's PowerPort Spring!