My biggest fear with the aftermarket wings is what happens when they flutter or are simply improperly installed and get torn off at high speed. I would hate to be hit by one while traveling at 70 MPH. That fear might be unsubstantiated but I fear it non the less. I guess I have trouble trusting the mechanical skills of a person that installs a device on their ride that is non-functional and in fact counter productive to the handling characteristics of the car. Unless you have access to a wind tunnel or you use the poor mans method, brightly colored lengths of yarn taped to your car so you can watch them at 80 MPH(while someone else drives). You won't have a clue what effects that wing is going to have or what forces are acting upon it.