Exactly. Transfer it from high pressure regions to regions of low pressure. Of course, if you design the shell of your car so that you minimize these regions, then you won't have to worry about tubes taking up space and fans producing both heat through inherent inefficiencies and also heating up the air by constrictions in the ducting... and also needing to supply a flux of air going 60mph with an area of, say 25 square feet.
Let's do the math, shall we? Say we use a duct with area 1 square foot. That means the air in the duct would have to travel at 1500mph. Another way of looking at it: 28m/s is roughly 100f/s, or 2500 cubic feet per second or 150,000 cfm. Which is a bloody big fan.