IF the wraparound sections follow the body lines, I would say it could only help by a negligible margin.
IF the horizontal piece follows the body line, its kammback properties might be negated by the increased wetted flow area. Remember, the purpose of a kammback is to reduce the amount of drag by to eliminating surface area.
IF you want it 'cause it looks cool, GO FOR IT, 'cause it's not hurtin anything significantly
IF you're justifying the purchase by saying it'll save you gas, it will probably take like four years to pay for itself if it even helps at all
=P
IMO it looks pretty cool.
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