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Originally Posted by Luwalira Cabrios are often heavier but you have to bare in mind that the Z4 isn't a cabrio. It is a raodster which was constucted to have a folding roof. Constructing a coupe version of it will mean adding a huge metal roof and making the frame larger. |
+ more rigid to cope w/ the power coming from the engine. The M coupe also has several more extensive modifications over the roadster. I'm sure BMW w/ out a doubt could have constructed something even lighter, but the buisness case for a model utilizing all new resouces would be a huge waste of money, what we have here is the cheaper more production effiecent alternative.