The design also better blends in the long slots with the curved channels that appear right in front of the rear tyre.
Furthermore, the struts that run across the slots have been beefed up to try to avoid excessive flexing.
As well as the floor changes, Ferrari has introduced a new design of engine cover which is more curved and now features a valley on either side in the centre of the cooling outlet.
This compares with the old nearly flat shape that the team has used up until now.
These extra channels alter the way the airflow is pulled through the bodywork and affect the localised stream.
Such a design works perfectly with the spoon shaped low drag wing that Ferrari has fitted to its car ahead of practice - although this could be a test for the Belgian GP rather than being something that will be raced this weekend. It is a design that was last raced at the Azerbaijan GP.
The valley shaped engine cover copies an idea that has been put to good use by Mercedes recently.