obviously mitsubitshi uses these on thier 06 evoIV MR but for what reason...... i mean i have done some reading on them and the gains seem miniscule, for ex.
"In areas where the body transitions at a rate of more than 12 degrees, turbulator strips, vortex generators, diffusers, very short fairings or other devices can be used to "trip the airflow".
The idea is that areas like the transition between the roof and rear window on the average car creates a large vortex. Any large vortices effectively grab the car and try to hold it back as it tries to slip through the air. If the air that makes up the vortex can be "tripped" before it leaves the back of the car, it will make smaller vortices, which will have a smaller effect on the overall aerodynamics of the vehicle. Measurement of the effects of these devices at highway speeds has been difficult to obtain."
so this is mostly for aesthetic purposes im guessing, has anyone used these yet on thier civic..? i would like to see some pictures of them installed. BTW, the reason this caught my attention was because there was a vendor's advertissment at the bottom of this web page.