check it http://www.youtube.com/watch?v=PHjeW37Nrpk.
(or lapping the ring in under 7 - http://www.youtube.com/watch?v=FJj8atDGBzk )
I was bored and got the idea that i should change the underside of my car to have better airflow underneath. Has anyone tried this with body pans, ducting, diffusers (not the ones with holes in your rear bumper), or the like? Figured it would be worth a shot and not too expensive if i make it myself. Any educated suggestions or examples welcome, thanks