Mike says in the news section of his site that the Peugeot and FIA/ACO findings point towards the louvers giving the cars better stability in yaw by reducing the lift of the cars near the extremes of their front and rear overhangs--of course, the FIA found out similar things based off the research that Nick Wirth and Delta Motorsports did in 2008/09, and that it was Peugeot who sold the idea to the ACO/FIA after their own testing of the items.
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