[MTrenk]

Not to be rude, but I'm just going around telling everyone that designing your own vortex generators without an engineering degree is a bad idea. Pretty much ANYTHING other than VG's in the aero mods section I think is viable for amateur ecomodders, but after studying vortices, there's no way anyone without access to CFD, extensive wind tunnel hours, or time to get a mechanical/aerospace degree is going to be able to reliably design their own effective VG's. If you want to try go right ahead, but chances are you'll hurt more than you'll help, especially if you're just eyeballing it.