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There is a hole in the bodywork over the exhaust header to help keep things from cooking.
Proper heat management measures are taken on components around the header with a combination of reflective gold stuff, exhaust wrap, and the silver thermal insulation.
Two things to observe here: the big side pod housing the radiator and the big airflow path between the rear tire and central bodywork.
Yes, the bottom of the car is quite flat for minimal drag and lift.
The underside of the rear bodywork terminates with this diffuser.
You can see the underside of the car is completely flat up to the diffuser.
