Rodger, Take your truck back out and Pull 24,000 GCVW up 8% grades untill you get the Radiator AND Intercooler working a little and you will see your under hood air Temps shoot up over 100 deg's higher than outside air. I had also thought that at higher speeds it would make little difference under the hood. Especially during the winter. My latest tests were at 75 MPH and 35 +/- 2 deg's. Untill I worked the truck hard I also saw (at cruise speeds) under hood temps closer (20 deg) to Outside air temps.
I currently not selling airsystems only testing any way possible to lower Heavy towing EGT's. So far I can stay WOT at 450 HP.
I was shocked by the difference when climbing the hill. I am at 6,000 feet so the truck/Turbo has to work a little harder. I switched from a stock box with K&N to a BHAF style to increase CFM's and because my earlier egt tests with the B-1 were at 65+ deg's and I wanted to simulate that air intake temp to check any improvements in lower exhaust temps. Next time I test I will try it again and take both air systems with me at the same time. Although my last tests were only 1 day apart when I switched the air to a Ducted style.