[Sven7]

Simply, it's very hard to alter the frontal area aside from removing mirrors and lowering the car. What is left aero-wise? Improving flow around the vehicle. It comes down to the "low hanging fruit" we all talk about. It takes but an hour or two to add rear skirts, and a little longer to make a coroplast partial belly pan. If you like doing projects as much as I do, you'll probably jump at the opportunity to optimize the aerodynamics. For some people it's not worth it.

Aeromods augment your driving technique by letting you coast longer. Phil has posted studies that show full belly pans improving car aero by up to 15%. Yes, aero mods make a difference. To say they do jack squat would be ridiculous. You've got to put the time in, though.