Some of this still went over my head, but below is a great article on pull vs push rod and how Red Bull had to change their car to fit in the double decker diffusers - and just how big these were in 2009/10 compared to what the rules were intending them to be.
http://scarbsf1.wordpress.com/2010/...t-is-looks-like-how-it-benefits-aerodynamics/
http://scarbsf1.wordpress.com/2010/...t-is-looks-like-how-it-benefits-aerodynamics/