I would think that the Nismo is the only one with any actual testing. Wind tunnel time is seriously expensive. Manufacturers can afford it easily. Aftermarket companies not so much.
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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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