Inside the Rahal Letterman Lanigan RLL BMW M6 GTLM
Every bit of the airflow around the front of the car is managed. The exit air for the radiator and the intercoolers leaves via the hood vents.  Small NACA ducts centrally located on the hood keep the turbos from cooking off stuff underhood.

The superfluous side bumper vents are closed off to help the splitter build stagnation pressure. All the air through the top and bottom grill openings is diverted with ducts to the heat exchangers.

Check out the Aerocatches holding on the hood.   Hood pins actually create a lot of turbulence and flush latches like the Aerocatches can actually make quite a big difference in overall drag!

You can see that all superfluous venting in the bumper has been closed off to improve splitter effectiveness. Closing off the side vents makes a huge difference in the amount of downforce that the splitter can produce.  The air split from around the radiator intake is used for brake cooling.
This small canard’s function is as a vortex generator.  It creates a side vortex that is enhanced by air spilling over the side skirts.  This helps seal off the bottom of the car from air leaking around the sides of the car and improves the function of the rear diffuser.
The M6 has a completely flat bottom made of carbon fiber.
Like the rear wheelwells, the front wheelwells are completely sealed to help improve aerodynamics.
The M signature side vents are functional to allow some of the slight amounts of high pressure underhood air from the hood NACA duct turbo and exhaust system cooling vents to escape.

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