Exhaust flap

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The height requirements with regard to acoustics mean that the exhaust system is fitted with a controllable exhaust flap. This is activated by the Digital Engine Electronics (DME).

The exhaust flap is opened and/or closed by a vacuum or electrically.

Adjustment by vacuum
The DME activates an electric changeover valve that applies partial vacuum to a diaphragm canister. The supply with partial vacuum is from the vacuum system.

The following graphic shows for example an exhaust flap that is opened and closed by a vacuum.

Fig 1: Identifying Electric Changeover Valve Exhaust Flap

Courtesy of BMW OF NORTH AMERICA, INC.

Index	Explanation
1	Electric changeover valve exhaust flap
2	Diaphragm canister, exhaust flap

Electric adjustment

The exhaust control flap is driven via an axially arranged electric motor with integrated gearing and integrated electronics.

The following graphic shows for example an exhaust flap that is opened and closed electrically.

Fig 2: Identifying Electrical Exhaust Flap And Plug Connection

Courtesy of BMW OF NORTH AMERICA, INC.

Index	Explanation
1	Electrical exhaust flap
2	4-pin plug connection