I can't imagine arbitrarily slapping a gurney flap on the sport spoiler would have any effect whatsoever. Usually when I see one on a car it's seen some wind tunnel testing and the flap was part of the overall plan, not an afterthought put on later.
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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent
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