Originally Posted by rldzhao
again guys, without more information about the car, materials, etc., it's very hard to determine exactly how much performance advantage a CF roof has over a steel roof.
Performance gain? Definitely. But NOTICEABLE performance gain? Hardly. Marketing? More than you can imagine.
Marketing... So I guess the only reason for not having the CF roof on other M3 variants is the lack of customers. Here's another question, and I've put up a poll to answer it: would you like to have a CF roof for your E90/E93?