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Originally Posted by Bob Z.
There is Black cover around the base of the spoiler on my 987S, which you can see when the spoiler is up - what is it for? And can it be removed?
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It is actually a part of the "spoiler" as far as air deflection is concerned.
It can probably be removed, if you think it will look neater. I doubt seriously any difference in rear downforce would result, as I doubt there is much downforce anyway. The air flowing through the gap between the body and the top of the spoiler may make noise.
The spoiler is not a wing and gets it's downforce from directing the air up at the rear of the car, very much like the original duck-tails of early Carreras. The later 911 variant whale-tails sort of combined the effects of the duck-tail with some wing effect at the outer edges.
I've seriously watched for any tell tale signs of downforce with the rear spoiler going up at 75, but be real, I haven't been able to distinguish anything.