They actually just got back to me, here was there answer:
"Hi Ben, it has something to do with the side draft of a car I think. The placement we suggest follows the placement on the Lancer Evolution 8 and they did some extensive wind tunnel testing.
Matt Dawson"
Mitsubishi must have done some more testing than just that one report that we've seen. Hopefully over the weekend I'll have the time to do the tuft testing that you recommend.
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