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For the BAR system there would have been an aerodynamic impact, whereas the benetton system wouldn't have had one, as it was desgined to accept it from the start.
The reason's i give for this are as follows
Neither of the existing suspension arms on the BAR are in the correct postion to "house" a driveshaft, so therefore a cowling would have to be placed in an already croweded area (the front suspension) to fit it.
Remember a few years ago, McLaren and Stewart ran the steering arms much lower down, in essecence having three arms connecting the front suspension. This was to get the weight of the steering rack lower. However the steering links were moved back into the uppeer wishbones (also raising the rack height) due to the aerodynamic advantage of having the arms there.
Also due to the size of the shafts (they would have to be fairly large, although not as big as the drive shafts), any cowling produced would be much thicker than a current suspension arm, and with the rules over aero profile of these pices (1 height to 2.5 length) would produce a fairly large section.
So your gonna get some form of drag increase by having such a system fitted.
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