[mikeinatlanta]

While the only way to know anything for sure is to put it in the tunnel, I would contend that the BD airdam may reduce lift by blocking air from going under car, but lacks the necessary lip protrusion to make any downforce whatsoever. Morris's on the other hand has a splitter that protrudes forward of the front body line, which should produce downforce. While the front line on a cobra body is pretty high above the splitter which muddies the water a bit, generally splitter effectivity is going to count how far it protrudes beyond the front of the body.

Would also contend that all else being equal, creating downforce inherently creates drag. An air dam that reduces lift could reduce drag, but actually making downforce will increase it.