How a car works

All partsBMW M4 CSLBodyBumpers › Rear bumper

Rear bumper

Part of Bumpers · about $1,900 to replace

What it is

Rear apron with CFRP diffuser.

What it does

Cleans up airflow under the car.

How it fails

Diffuser fins chip.

MaterialPP/EPDM, CFRP diffuser
Rear bumper highlighted on the car

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