I've been wondering...there have been so many 4/4 SPORT windscreen cracks...........I notice that the sport cars (with no spare wheel) lack a whole stiffening cross member thingy at the back of the car. Quite alot of the normal structure is just not there.........could these cars be flexing more than ordinary cars and stressing the windscreen. I wonder if the factory has considered the effect of removing so much framework at the rear? Nick