All parts › BMW M4 CSL › Exhaust 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.
| Material | Grade 2 titanium |
|---|---|
| Spec | 9 kg |
| flaps open above 3,500 rpm in Sport+ |