Found a picture of the Sauber from 1998 with the "X Wings" If I rememebr right, they named them after their sponsor's headquarters, the Petronas Twin Towers. Alesi had one ripped off by an air hose at a pit stop during the Argentinian Grand Prix. Everyone but Williams, Minardi, and McLaren ran them for a few races before the FIA banned them on safety grounds. I believe the late Dr. Harvey Postelwaite first used them on a Tyrell in 1997 at the Monaco Grand Prix.
Did the work? The teams said they did, but this may be a case of money see, monkey do.