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According to the BMW accessories brochure it says "Rear Spoiler. Further emphasises the sporty feel as well as bringing about a noticeable improvement in downforce"
As far as the carbon fibre lips it says this.
"Aerodynamic components, the carbon attachments on the left and right sides of the front apron accentuate the powerful looks of the BMW 3 series." says nothing about performance .... anyway BMW will say anything to get the sale haa lol
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