RE: How will aerodynamic testing change the Challenger design?
I agree 100%.
The new Challenger HAS had aerodynamic improvements implemented in it's styling while keeping the same overall appearance/shape as the original. Just the integration of the bumpers alone cuts down on drag and improves mileage - as well as lends itself to the modern take on a classic muscle car.
The dimensions have changed from the original, but the proportions look very similar because of the way the designers have incorporated modern materials, manufacturing techniques, and engineering.
It's perfect just the way it sits.