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Beats me, but I am sure that form wasn't there by accident.
I guess it is just another way of trying to redirect the air 180 degrees for the 2 front cylinders instead of using a wider shroud and air deflectors like porsche did.
My other guess is that since shops only sell the new C2 style fans with Valeo (Rabbit-style) alternators which run in aftermarket fan housings (the only part of a porsche fan set up still available new through porsche is the curved fan itself, hence the aftermarket stuff), they had to make up for the not-listed-anymore porsche air deflector, which wouldn't fit a new housing anyway, by re-shaping the shroud itself...
Personally, I like a deep shroud with air deflectors better.
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