Nice article from Hot Rod wind tunnel testing with '5 aero mods that almost always work'
http://www.hotrod.com/how-to/paint-body/113-0703-car-aerodynamics/


-'02 Dodge Viper Ex-World Challenge racecar
-'73 Duster, 6.1 based 392 hilborn hemi, tko600, full floater rear 9", Hellwig custom bars, viper brakes, built for road course