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Stijn, the air outlets on the lateral side of the car ahead of the front axle have an effect of masking the front wheel wake for reduced drag and lift. I see a very functional looking diffuser, which makes me wonder how they vent the cooling air for the engine. Perhaps it exits through the new openings made between the standard longhood rear bumper and the extension piece. All these details are exactly what we applied on World Rally cars from 2016 and 2017. The roof slot was also proven on WRC cars from a slightly older generation. I suspect it is even more effective at energising the flow over the rear window and reducing lift on this fastback shape. So for me, the whole package looks pretty well optimised for a general GT car shape. But still this car is unmistakably an air cooled 911.
The cross brace on the door could be very structural. It would be easy to design a composite structure there which is as strong as roll cage door bars.
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