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There is a very small horizontal lip down low at the rear of these specially formed
Cadillac prototype panels.

TRAP SPEEDS
The big trap speed numbers for Daytona Prototype internationals seen at the mid-December IMSA test are down at the Roar due to the Balance of Performance changes made between the events.
The 200.5 mph peak achieved by Ricky Taylor in his No. 10 Wayne Taylor Racing Cadillac DPi-V.R last month set the tone for the new formula's speedy potential, but that number has been knocked down to 191.5 (so far) for the No. 10—which led the other DPis--in dry running on Friday.
The drop has been attributed to a tall 30mm Gurney tab added to the back of the Cadillacs through the BoP (below), and with the increase in rear downforce and drag, the parachute-like effects of the change are told through the decreased top speed.

With a need to run in low downforce and drag settings to maximize speeds on the long Daytona straights (seen below in December), the 30mm rear Gurney has cause an imbalance for the Cadillacs; solving the imbalance by adding more front downforce is the obvious solution, but that fix would increase overall drag and downforce, which goes against the need the aforementioned need to run in a slippery aerodynamic configuration...

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Cadillac Coverage of the Daytona 24