Originally Posted by synclastica_86
What do uoy mean by replacement? Do you mean that the original will be taken off so that there will be an actual weight saving?
Naturally. I think it would be nearly impossible to do a CF roof correctly if you were to attempt to overlay it on top of the existing steel roof. The M3 coupe's carbon fibre roof is also designed in this same manner.
As with the coupe, the CF itself will provide only slight weight savings. The real weight savings comes from the fact that you do not have the moonroof and its necessary hardware.