[kamip]

One thing they should consider on the new TDI are optional aero kits. Something like partial rear wheel covers or smooth hubcaps, block off or reduced plates for the front grills, or maybe aero spoilers instead of sport spoilers. These could be bolt on or glue on, and wouldn't require any major body changes. Maybe there can be a small market for these?

They would sell well but I think only the rear wheel covers would have much effect. Covering the front grille might help a little but the rear of the car is where all the easy gains are. The trunk should have a more teardrop shape for better aero and unless you want to stick a large body add-on to the rear, that's pretty much impossible.