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If the guy tracks his car, it serves a very valid purpose. My wife is building one for her dedicated track car right now and the people she competes with at events who have aero (splitter, wing) can put down lap times ~2 seconds faster because of the added downforce through the turns.
If its on a street car.... not something I'd personally do.
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.
