Does anyone know what front lip this is? Looks similar to the BRE style non-vented, but is rounded off in the corners.
http://petrolicious.com/this-nissan-fairlady-240z-l-is-a-rare-japanese-survivor
Attached is an article I scanned in from a May 1974 Car and Driver. They measured the drag and downforce of different spoilers and air dams on a 240Z, and even provide performance and fuel economy improvement numbers. Very good stuff for those who are wondering whether they should add aerodynamic aids to their Zs. For example, a non-ducted Spook is a pretty good add on, as others have noted from their own experience.