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Old 07-21-2010, 07:22 PM   #6
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Join Date: Dec 2003
Location: Wichita
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My Ride: 2011 E90 M3
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I would be inclined to recommend the ACS rear wing and splitter or Alpina aero. IIRC, they actually do aero testing. I think Alpina partners with BMW to use their facilities for aero testing. So those products should provide some amount of known downforce and known results.
2013 F30 328i - Melbourne Red
2011 E90 M3 - Monte Carlo Blue
2004 E46 M3 - Imola red
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