You'd be amazed the type of advantage a team like Penske, with all the available resources has over everyone else. Everyone is kidding themselves if you don't think a mustang body on a COTF chassis wasn't over in the US in a Wind Tunnel before all the homologation tests.
I don't think there's anything to stop a team putting a car into a tunnel before homologation. The rules state you can't use a tunnel, but no reference as to what point in the life-cycle of the car.
The Mustang would have had a tonne of CFD done on it, and then verified on track. But we have no idea what Ford Performance in the US did behind closed doors to verify CFD data.
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