There are questions now and then, so thought I could sum up what I have found so far when I had it apart.
Here is how it look, butterfly valves circled. They are normally open, and need vacuum to close.
From below:
Electronic valve actuator:
Electronic valve actuator is located behind the boot:
Actuator is letting vacuum go through(silent) when not activated. If activated, it drains butterfly valves to atmosphere, they open, and exhaust get louder.
Not verified with multimeter, but relatively sure.
Vacuum is supplied from engine vacuum pump, therefore it barks at startup, because pump has not had time to make vaccum yet:
This means that it should be far from impossible to retrofit, by just using a switch.
Here is how it look, butterfly valves circled. They are normally open, and need vacuum to close.
From below:
Electronic valve actuator:
Electronic valve actuator is located behind the boot:
Actuator is letting vacuum go through(silent) when not activated. If activated, it drains butterfly valves to atmosphere, they open, and exhaust get louder.
Not verified with multimeter, but relatively sure.
Vacuum is supplied from engine vacuum pump, therefore it barks at startup, because pump has not had time to make vaccum yet:
This means that it should be far from impossible to retrofit, by just using a switch.
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