BMW i8
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9 Exhaust flap (with exhaust flap actuator)
This exhaust flap is controlled by the DME (Digital Engine Electronics) and is closed in idle position, at low load and in coasting/overrun mode. As a result, the noise level of the combustion engine is reduced. At high load the exhaust flap is opened, whereby the exhaust gas back-pressure is reduced and the engine performance is increased. The exhaust flap can be replaced separately from the rear silencer.
