1.1-30 adjustable.Lightweight design. 2.Comes with hardware and fittings for installing. 3.A manual boost controller is a simple mechanical and pneumatic control to allow some pressure from the wastegate actuator to escape or bleed out to the or back into the system. 4.This can be as simple as a T-fitting on the boost control near the actuator with a small bleeder screw. 5.The screw 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. 6.These devices are due to their negligible cost compared to other devices that may offer the same power increase. Functions: 1. Turbine pressure regulator, which can regulate air pressure, engine performance and reduce fuel consumption. 2. Why install a turbo regulator? There is an exhaust pressure relief valve on the supercharger. When the pressure reaches a certain level, the pressure relief valve will open to reduce the turbine speed, the engine, and limit the boost value. This product is to make the exhaust pressure relief valve open late to increase Boost value Specifications: Item Type: Air Intakes Features: Boost controller Model Year: All Fitment: for all turbo & supercharged ( pressure only, will not work with vacuum actuators.) Colour: red Material: aluminum alloy Package Contents: 1 * Manual Boost Controller 1 * Diverter Tee 2 * Billet Mounting Bracket Note: Instruction is NOT included. Professional installation is highly recommended. Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.