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Old 10-28-2009, 03:26 PM   #7 (permalink)
NeilBlanchard
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Mica Blue - '05 xA RS 2.0
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Hi,

I think the edge is there to help the air separate cleanly. Similar to this bit on the rear quarter of the Toyota/Scion iQ:



There is a little wedge on the rear quarter window, and the bit behind the rear tire look similar...
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