It's comforting that Volkswagen AG would allow the budget to handle the R&D costs which lead to the design.
At around $2,000/hour for wind tunnel testing,in a world-class facility,it's been reported that Ferrari has spent upwards of $100,000 for proving out a single aerodynamic modification.
The last article I have for cooling drag dates to 1976,with the Dr. Alberto Morelli/Pininfarina collaboration on the Italian State-funded,low-drag,CNR 'banana' car,which had some amazingly efficient,ducted extractors,tuned to the exterior flow environment.
