When looking at the Space Shuttle boattail, I see that it is a bunch of airfoils shaped teardrops stuck together. This is especially apparent at the top portion of the boattail where the engine housing is the widest.
Looking at your car, you have something similar, only flipped vertically. The wheels bulge out farther than the rest of the body. I wonder if you could create a bunch of stuck together airfoill shapes like the Shuttle has.
Oh well. ( Brain fart. )
