I posted some pictures that I took of a March 2002 Hot Rod magazine article that I thought you folks might find interesting. I was in a hurry to return the magazine to the library, so I just used the camera instead of the scanner ... sorry.
At least it will give you some idea of what was in the article.
You can find the images here
http://www.flickr.com/photos/82006403@N00/
( Also be sure to read the comments below the image when you click on the image )
The article covers how that Hot Rod took an '81 Camaro and by adding a huge air dam and spoiler to the car got it to.201 Cd ... or close to that of the EV1 !
This just goes to show how unpredictable that airflow is. You can spend hundreds of hours rounding out corners and fitting belly pans to you car ..only to find that your .Cd has changed by a small amount - and then some dude in a beat up old car slaps a huge air-dam and spoiler to his car and beats you by several .Cd counts, leaving you in his low drag wake .
Nerds laugh at me 
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