1Premium Material: The manual boost controller is made of high strength aluminum alloy material, which is sturdy in structure, wear resistant and durable. 2Main Function: To allow some pressure from the wastegate actuator to escape or bleed out to the atmosphere or back into the intake system. 3Fine Workmanship: The boost knob could adjust turbo pressure, which is professional manufactured, ensure stable performance and high reliability. 4Feature: The screw near the T fitting can be turned out to varying degrees to allow air to bleed out of the system, relieving pressure on the wastegate actuator, thus increasing boost levels. 5Easy Installation: Designed to be mounted in your car or under bonnet. The turbo engine controller kit with 10 pcs of installation accessories, which will make the installation easy.