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My source for the roof savings would be be the engineers at BMW ///M and materials do you want their names? It is between 11 and 20lbs less for a CF to a steel one (I have been given 2 numbers- early to late and not sure) and about 45 for one with a sunroof.
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I've heard the same numbers. I'm pretty sure you can go through the original press releases for the ///M3 and ///M6 to get the numbers. I'm just too lazy to do it. FWIW, I think my estimates are pretty solid in terms of weight.