Okay... so let's make it clear once and for all. Apart form the weight savings that can be offset by one less happy meal from Mcdonnels, does the CF roof give any performance advantage over a steel roof?
Is it possible to make a CF roof for the E90 or E93? See, since the E93 does not rely the roof for any structual strength isn't it better to make it as light as possible?
Current: BMW F32 435iA, M-Sports; BMW E92 M3, M-DCT; Mercedes Benz W221 S550 4matic, AMG Sports package
Retired: BMW E93 323iA; BMW E85 Z4 3.0i, SMG; Lexus IS 250 AWD; Lexus GX 470; Mercedes Benz W203 C230 Sportscoupe