Stainless steel exhaust flap 2.75", 70mm flap control vacuum controlled

If you're looking for individuality, you've come to the right place. With our stainless steel exhaust flaps, you can build your own customised exhaust flap. Whether loud or quiet is up to you. Features: Inner diameter: 70 mm Outer diameter: 81 mm made of stainless steel adjustable Vacuum-controlled the flap is closed and then opens with decreasing negative pressure The function of the dampers is simple: When closed, the exhaust gases are channelled through a silencer. As soon as the flap opens, part of it passes through, for example, a continuous pipe or silencer replacement. This makes the exhaust louder. The vacuum-controlled flap is closed in the vacuum range and opens as soon as the vacuum decreases or, in the case of turbo engines, goes into overpressure. For example, a hose is laid from the intake manifold to the actuator of the flap or, alternatively, the flap is controlled via a remote control or switch. A pulse valve is then installed for this purpose.