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Woah there! It's highly likely that they put that secondary flap behind the subframe for good reason. It is quite common for normal production cars to have various little flips scattered around underneath in order to get the airflow to 'jump' over obstacles or features which would otherwise cause greater disruption. They are especially common around the exhaust and fuel tank areas, particularly if there is a void or sudden change in floor height.
A few years ago I had to reduce the drag of a hatchback for a far-eastern company but without making any visible changes to the car, both for styling and cost reasons (visible parts normally have to be painted, at extra cost).
In the end I got 10% just from better shielding of the front wheels and other problematic areas under the car.
The full-width front air dam can be sometimes just there as a kind of blanket measure for stopping air going under the car and smacking into nasty things down there. Often though the effect of the air dam on lift can be a problem so the centre section, which usually offers the least drag benefit, is cut out.
On the F430 this is for a different purpose. It has a flat floor so doesn't have to worry about the air hitting things and the raised nose section increases the flow to the diffuser. Look at the Challenge Stradale or some sportier BMWs and see how they still achieve shielding of the front wheels by deepening the main part of the front bumper only in front of the wheels.
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