Seller notes

--- Black Rear Performance Style Diffuser For BMW 3-Series 2007-2013 E92 Coupe 328i Important message: Made in Taiwan. Direct replacement. Easy Bolt-on Installation. Note: Fit models with M-Sport rear bumper only. The rear end of a car underbody is where a diffuser is usually located. It accelerates the velocity of the airflow underneath the car to create downforce. The pressure under the car is affected by the diffuser so that it can expand back to ambient in the diffuser, as the car moves forw...

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