The Mityvac Pressure Vacuum Pump is one of the most valuable tools to have for correctly setting up turbochargers. Modern turbo systems rely on electric wastegate solenoids which allow turbochargers to target specific boost pressures whether your vehicle is at sea level or elevation. The maximum and minimum boost pressures dictated by the ECU programming in conjunction with the boost control solenoid is a function of wastegate spring pressure - this is why it crack pressure is so critical. The Mityvac allows you to set this properly for maximum performance and safety.