IndyCar went with the aero screen instead of the halo used on Formula 1 cars. I imagine the teams use side intake plates with different opening areas depending on the cooling needs.
It’s been a while since I kept up with IndyCar powertrain tech. It’s clearly twin-turbo with the wastegate dumps separated from the turbine outlet flow. The hot air coming off the heat exchangers dumps out those louvers. It’s a bit hard to see, but just outboard of all that hot airflow is the cooling air to the rear brake ducts. Oh yeah, IndyCar uses a hybrid powertrain now.
I find it slightly amusing that open wheel race cars are using 15” wheels and 20” wheels are common on street cars. IndyCar uses magnesium wheels, but they have talked about switching to aluminum for cost reduction.
It looks like the front brake ducts are grabbing air coming off the bottom side of the front wing. There is a lot of range of adjustment for the front wing judging by the length of the slot next to the adjuster.
Speaking of street cars with big wheels, the Hyundai Elantra N comes with 19” wheels to fit over a big set of brakes.
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Little bit about the Nissan Z.
First of all, there is no 400Z, only Nissan Z.
Secondly the partial shiny disk inside the wheel, I believe is the rim itself.
Third, the exhaust splits into two. One side of each split continues on, the others cross over to either side, basically forming a “Z-pipe” or Borla “Switchfire” type layout.