My motorhome is a 1995 Class-C Ford E-350 with a 460 EFI engine...I have upgraded the exhaust with Thorley headers following the dreaded exhaust leaks and snapped bolts...I am now ready to upgrade wit...
On our older E350 (the pre-1992 and pre-EFI ones) I found that some of the elaborate factory air intake parts were missing. I got rid of the rest and connected the transition through the radiator support to the inlet of the OEM air filter using flexible clothes drier hose. I think getting air that isn't hot from being in the doghouse area is good. But I doubt there's a ram-air effect.