McLaren 570s Rear bumper bumper diffuser 13A3726CP

the part number 13A3726CP refers to the Rear Diffuser assembly for the McLaren 570S. This is a critical aerodynamic component that manages the airflow exiting from under the car to create a low-pressure zone, significantly increasing downforce at high speeds.

1. Technical Identification

The “CP” in the part number typically stands for “Carbon Program,” but for the 570S, there is an important distinction in finish:

• Standard Finish: Most units under this base number are finished in Dark Palladium (a dark metallic grey composite).

• Carbon Fiber Upgrade: If the part number includes a specific MSO suffix (e.g., .01 or MSO), it refers to the visual Gloss Carbon Fiber version.

• Fitment: This is designed specifically for the 570S Coupe and Spider. While it looks similar to the 540C diffuser, the 570S version is more aggressive. It will not fit the 570GT or 600LT without changing the entire rear bumper surround.