Identify this part

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Originally Posted by Frodo

I still don't know why they call it a "Brake Spoiler Edge" when, from the above descriptions, it is designed to cool the tranny and has nothing to do with the rear brakes

Actually Frodo I believe it does. These spoilers create a lot of positive air pressure in that area of the car. The primary exit points are through the rear wheels (brake cooling). We need a visit to a NASA wind tunnel to see it visually though.