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Technical Question
I'm curious, is the rear diffuser on the E92 M3 a working device or just a showpiece? I'm no aerodynamicist, but doesn't the airflow under the car needs a clean line (hence the partially covered underbody) for the extractor/diffuser to work properly at the rear? If so, why is the big exhaust silencer situated right in the middle of the airflow channel towards the diffuser?
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