Went out to the local canyons and ran the piss out of the car yesterday for about two hours, burned a tank of gas with just one 2 minute bathroom break. IAT's stayed rock steady the entire time, 30 above ambient max (redline, 2nd gear).
At cruise speed (75) coming back on Interstate 8, IAT was only 10 above ambient, I kid you not. WOT at highway speeds I saw as low as 15 above ambient at redline in 4th gear), and no higher than 23 above ambient redline in 3rd gear.
I like it, a lot.
However, I don't know that those low IAT's will show up as more HP on a dyno, just not enough fan effect to simulate 65-120mph airflow.
I also managed to source a GOOD carbon fiber hood, this one is ten times as nice as the old one, with OEM vents, cutouts for the washer nozzles, and attachment points on the underside for the factory hood struts, and the damn thing actually fits and lines up. Pictures soon.