Gary Eaker, who started life as an aerodynamacist for GM and then for Hendrick Motorsports and who is now owner of the Aerodyne and A2 wind tunnels near Mooresville, NC, used Gen 3 firebird at first with just a small air dam to go about 230 with 650 NA hp and then a "special" somewhat modified nose to go 295 and a turbo SB supposedly in the 1200 range. My car is basically a copy of his and went 170+ with a 2liter 4 cyl. I have some tunnel time that equaled to slightly better than what he got in GC configuration but beats what he got though in Alt and CC configuration which is of course a bit different. You have to be careful comparing tunnels though as, like dynos, they can give different numbers in different capability, locations and set up (not to mention $$$$$/hour.) And rather than saying look at the great Cd number I got, look at the total drag and lift numbers which in combination with the frontal area and some formulas give the calculated Coefficient of Drag.
