That is not correct. As I have stated in previous posts on this topic, mine have cracked, and I have never slammed the trunk lid. I never even use my trunk as it is my weekend driver that I do not use for shopping etc. I treat my car extremely well, and anyone that knows me, knows how meticulous I am with her. There is no definitive answer to this, but my best guess is that it is the downforce at high speeds that is causing the stress at that point. The cracks are happening right where the uprights meet the wing. I know others that have had the same thing happen to theirs, and they have stated that they have never slammed the trunk lid.

The Roadsters are the only ones having this problem. The coupes do not have this issue. If you look at the difference between the roadster and coupe wings, the roadster uprights are angled quite a bit more than the coupe. Combine the angle of the upright, and high speeds, and there will be a lot of stress at that point. I have had mine in excess of 150 MPH so that is why I believe it is the problem.

And, I don't want to be testy here, but to state that it is caused by slamming the lid, is implying that the people that have this issue do not treat their car properly which is most definitely not the case.