Ferrari’s floor has come under scrutiny from rival teams, who suspect there may be a mechanism that allows it to move illegally.
Although he did not name Ferrari or specify floors, McLaren boss Ron Dennis says he is confident that are cars whose performance will be affected in the near future if certain technical rule interpretations are clarified.
However, the article did state:
If the front of the floor drops at speed it could create an aerodynamic stall, which improves straightline performance.
Which does leave me to wonder how accurate the rest of it is... seeing as you would never want to play with stalling the floor. You'd have one very pissed off driver if the floor downforce decided to disappear mid-corner!