How a car works

All partsBMW M4 CSLExhaust system › Rear silencer

Rear silencer

Part of Exhaust system · about $2,600 to replace

What it is

Titanium rear muffler with two electrically controlled flaps.

What it does

Reduces noise to the legal limit and opens up in M mode.

How it fails

Flap actuator motor fails: stuck quiet or stuck loud.

MaterialGrade 2 titanium
Spec9 kg
flaps open above 3,500 rpm in Sport+
Rear silencer highlighted on the car

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