Made of 304 stainless steel, ensuring rust resistance and high temperature resistance. Operates through vacuum suction with a pressure adaptation range of -2psi to 5.5psi. Supports switching between "normally open/normally closed" modes for versatile performance. Comes with a wireless remote control for convenient valve status management. Designed for easy installation on 1.5mm thick exhaust pipes, compatible with most gasoline vehicles (diesel vehicles require an additional vacuum pump). This is a 76.2mm (3-inch) universal automotive exhaust pipe vacuum control valve set, suitable for exhaust pipes with an outer diameter of 76mm, with both rust resistance and high temperature resistance (ceramic bearing components to avoid plastic parts from failing at high temperatures). It drives the valve to open and close through vacuum suction. The valve closes at idle to ensure quiet daily driving; When the accelerator is deeply pressed or the turbo positive pressure intervenes, the valve automatically opens, instantly releasing the sound of the sports car, while optimizing the exhaust flow rate to enhance power response. It is a cost-effective exhaust control solution that balances daily noise and modification noise. Color: As Shown Material: Stainless Steel Package Contents: 1xCar Exhaust Pipe System Control Valve Sets Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.