If I could figure out a way to make a WRA (Warm Ram Air) without hacking up my car, I might try it. Although I'd probably try it anyhow if I thought it would work. My perception is that there might not be enough heat transfer in a 5 to 6" duct through a heater core type radiator. Maybe I'm wrong though because my heater can blast out some real hot temps...It's all about CFM's and BTU's and I don't care to do the math. Just gotta make loop of hose before the heater core to run down below the bumper, duct thru a heater core and see what happens....
Might not need a radiator after that
Anyhow, fender skirts are on and drove them to work this morning. No strange looks yet... Did get my best to work commute mpg since the winter gas hit. 47.5mpg, almost 48 but a couple stop lights really got me. The change is not huge, but it is noticeable. I usually coast the down side of the bridge, 1.5 miles, I'm at 50mph at the top and in the summer I'm about 55mph by the bottom. As soon as it got cold I'm struggling to keep it above 40mph. But it's been warmer the past couple days so I expected it to slow down to 45mph, but it kept 50mph the whole way. I also noticed my fuel consumption to be just slightly less. The skirts are quick release so I'll be able to do some coast down tests when I get some time.