No downforce, but definitely a source of laughter -
http://donksnob.com/
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2012+ 09 E93 335i - Space Gray, N54, Sport, Premium, Comfort, Logic7, Nav Mods - Reflectors, LUX, Pedals, M3 Spoiler, Black Grilles, Macht Schnell, Aero, ESS, StopTech
2011-12 07 E60 M5 - Indy Red