Do body kits improve aerodynamics?
In most cases, no. Most body kit makers simply do not possess the knowledge or economic resources to perform the necessary wind tunnel (or CFD based) testing. The vast majority of bodykits, wings and spoilers are purely cosmetic and any additional aerodynamic benefit (or detriment) are completely accidental. With that said, one notable exception would be C-West, which does perform some level of aerodynamic design and testing on their products.
