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Sorry for asking a stupid question, but what does the roof spoiler do? Does it add downforce like the trunk spoiler, or does it help keep the rear window clean during inclement weather?
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2002 X5 3.0i/man.*
2006 330i/man./Arktis/Grau*
2001 525i/step./Schiefergrün/Sandbeige*
2013 X1 xDrive35i Alpinweiß/Schwarz/M Sport/Dinan Stage 2
*retired
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