Guys,
While I understand that the scoop will disrupt the airflow a little I think the problem is with the shape of the back of the car. The most aerodynamic shape is a teardrop shape (round end first). I don't think any amount of bonnet smoothing will overcome the drag caused by the rear of the car. Wouldn't you be better off extending the arches to cover the wheels and adding an undertray the length of the car to reduce drag?
I do agree however, that the big scoop lets cool air in and most of us want to let the hot air out. For this a bonnet like the SE one will help.
Just my understanding, any comments???
Cheers,
Dunc