Thread: what is this??
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      12-07-2012, 06:32 PM   #4
Dark_Knight_335
Came to the N55 Darkside
 
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Drives: 2011 335 E93 M-Sport
Join Date: May 2010
Location: NY/NJ

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On any car- unless you're doing over 120 mph- it does actually nothing but look nice.
Even then, gains are negligible IMO.
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