But it would be possible to pipe ram air through  the
     > filter.   The advantage is one system that one does not have to operate
     > with cables.  Is the ram effect lost when the air has to pass through a
     > filter?  Or could the effect be salvaged by using a larger filter?
     > Thanks,  Jerry

Jerry, Ram air will work fine through a filter. The thing is that you will
get a pressure drop just like you get through the radiator ducting.
Most modern cars have a large square flat filter. The air box will have
a large clear area behind the filter. As Paul has mentioned leaving as
much area clear behind will result in the lowest pressure drop.
Bill Jepson

 
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