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E-Valve (Exhaust Valve / Electronic Valve):
In BMW cars, this often refers to an electronically controlled exhaust valve — part of the exhaust system that adjusts the exhaust flow to control sound and performance.

• Found in M Performance models, such as the BMW M3, M4, M5, etc.

• When the E-Valve is open, the exhaust is louder and flows more freely.

• When it’s closed, the exhaust is quieter for comfort or regulations.

• It’s controlled by the ECU (engine control unit) or drive mode selector