Here's a link to the build page.
http://forums.hybridz.org/topic/63250-mike-kellys-zcar-project/
Every aerodynamic "accessory" was tested when we did extensive wind tunnel testing in 2007. I wrote a magazine article for Nissan Sport/Sport Z magazine in 2007 after we conducted the 31 tests on 4 different cars and multiple configurations. Quite simply, if it isn't functional, it isn't on the car.
Enjoy!
Mike