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      09-16-2008, 05:22 PM   #55
Doc
Second Lieutenant
 
Drives: E92 M3 AW/Blk sunroof 19s
Join Date: Aug 2008
Location: Cape Town, South Africa

Posts: 288
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I think that BMW added the carbon roof to the coupe only for marketing reasons. Performance benefit in terms of rigidity an weight are not significant between the steel roof and carbon roof with the rigidity of steel matching the performance gain of lighter carbon. The sedan does not have it since its the family option and most guys choosing it want more luxury features such as a sunroof.
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